alternator only charges at high rpm
Delco alternators are typically rated at 5000 rotor RPM (don't have data for Bosch, but it's probably similar), and with typical drive ratios of 2.5:1 the alternator should be … 9. Each alternator has a design amp output (at spec voltage) versus rotor rotation speed. $4.49 shipping. So this is gonna be my 3rd post about alternators.. and just looking for some advice. The minimum RPM is highly dependent on the specification of alternator. I'm starting to lean towards my PCM maybe...I backprobed the brown wire going into the alternator and it drops to under 1volt when I go high rpm. Using a smaller pulley on a high revving engines can cause component failure from extreme speeds.Alternators are only good for about 15,000 continuous RPM's, the lower the alternator RPM's the longer your alternator will last. Checked to see if the Alt was leaking A/C voltage, tested the alternator (works fine at idle/low rpm, then just drops to zero above 3000rpm), made sure the belt is not slipping. Using a higher amperage alternator, you need to upgrade the charge cable to handle the higher current that will be passing through or the power will be restricted. I am working on a school project. More Buying Choices $69.96 (2 new offers) I can turn everything on and it will handle the electrical load fine but if I … If you’re going to spin your Chevy small-block to 7,500 rpm, that’s 22,500 rpm alternator speed. Sounds like a faulty alternator (VR flaky). Efficiency peaks at around 3000rpm, ie 50 amps, and will only give small increases over this, regardless of the rpm. Check the alternator drive belt to make sure it's tight. After that, higher rpm can produce slightly higher amperage output. It IS charging, just not as much as you’d like to see and that’s probably due to the idle rpm, which in your case I think 800 is normal. You would know this already know this if if you had a $20.00 multi-tester. It's only the last few months where I've been driving sensibly that it's become a problem. A small car alternator is rated about a 60 amps maximum. 3 Answers. I have an inclined cart mounted on rails moved by a winch. 10si 12 Si alternator charge wire plug with diode keeps alternator charging at low RPM. If the alternator was working fine in the other vehicle, have the battery tested if necessary. These alternators also tend to be temperature-sensitive: In a higher ambient temperature, such as is common in an engine room, their output quickly falls by 50 % or more. I install a new a alternator but is not charging at higthrpm only charges at low rpm ,what could be my problem? The Alternator is directly connected to the engine crankshaft through belts & pulleys (in a car, motorcycle differs). However the output of your alternator is controlled by the voltage regulator. The alternator on my car is the original design and, is working as designed. Your #1 terminal must not be seeing voltage. Check voltage at battery, and verify that it is not charging (about 11.5V while car is running with lights on, etc.). I recently had an issue with my alternator. Put car in gear, and "Alternator Workshop" light comes on. Standard alternators, originally designed for the car industry, only deliver sufficient energy to both charge the batteries and power the various onboard consumers when they reach a very high rpm. How many volts is the alternator charging? The battery is less than a year old. You may not have a problem. how to calculate your alternators RPM's you measure your crank shaft pulley size and then your alternator pulley size. Where is the exhaust VVT solenoid located on a 2010 Kia Forte 2.0L? I would like to install an alternator on one of the cart axis, so I can charge a 12V car battery - 20Ah. Normal alternator charging voltage is between 13.5 -14.2 volts. Verify that battery is now charging at 14.3V, and will continue to do so until the car is shut off for some time. Still, that is mighty near the low end of the Leece Neville capability curve so I suspect it is a higher RPM alternator intended for use with a bigger engine having a large diameter crankshaft pulley. year make . 4.3 out of 5 stars 11. I would like to install an alternator on one of the cart axis, so I can charge a 12V car battery - 20Ah. Alternator not charging at high rpm on 87 Volvo 740. Instead of a 3:1 ratio, you want something more like 2:1 because most alternators will not tolerate more than 18,000 rpm maximum. I put everything back together and installed the alternator in the car. INTRODUCTION. Do you have a warranty on the one you bought? I am thinking the alternator will only supply enough volts for the operation of the motor. Keep VAF Going Donate methods Point your camera app here to donate fast. … You can sign in to vote the answer. I took the connector off the alternator to make sure voltage was appearing at the two input leads. How bad does wind have to be to knock out power? Did you use the old pulley on the new altenator? that alternator is pcm controlled. If it is less than 12 volts, charge the battery. Problem: When car is revved up high, around 5,000 RPM, either while free revving or flooring it on the highway/road voltage spikes up past 17v sometimes to 18+ depending on how high RPM. Delco alternators are typically rated at 5000 rotor RPM (don't have data for Bosch, but it's probably similar), and with typical drive ratios of 2.5:1 the alternator should be capable of max output at about 2000 engine revs. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. At about 2000 rpm the alternator produces about half this maximum, so at engine idle the alternator is charging well. *edit* also, try just driving it around constantly for about a half hour at high speeds (get on the highway and then turn around) to see if the alternator charges the battery. So 600 engine rpm idle would yield 1560 and 1680 alternator RPM respectively. is it a good battery? Weird behaviour, I can only assume something is loose inside the regulator, or the regulator is starting to break down. On my 2000 Astro, 197,000 miles, the alternator cuts out at high rpm. Thread starter greiswig; Start date Dec 31, 2012; G. greiswig Member. I managed to nurse the car home by revving it a lot, and after 2 miles suddenly all the electrics came back to life. I already replaced the voltage regulator but still no luck. Replacing the alternator … Joined Jul 12, 2011 Location Orygun TDI 2005 Passat 2.0 TDI-PD Dec 31, 2012 #1 Hi, all, and Happy New Year! Worded differently, Eco-Tech alternators generate between 75% and 80% of manufacturer’s rated full output (at 2,000 engine RPM’s or 6,000 alternator RPM’s) while operating at the typical engine idle speed of 600 RPM’s (1,800 alternator RPM). I tested the battery voltage and it was 6v! Still have questions? Feb 4, 2018 #1. Most alternators need to spin at about 2,400 rpm at idle, have their maximum output above 6,000 rpm, … Once alt is making some output, the exciter runs of the main output. If the need of the alternator drops to 1000 rpm, the generated voltage per phase will be (A) 180 V (B) 150 V (C) 140 V (D) 105 V. Get Answer Start the engine and slowly increase the speed to 1,500 RPM 6. Each alternator has a design amp output (at spec voltage) versus rotor rotation speed. So turn your ignition on and carefully check to make sure all the alternator warning lights illuminate. I can always up my idle speed but am looking at another option. ... battery only a couple yeas old but will get it tested to make sure i didn't kill it driving with no alt working. op has already stated that the alt light comes on. 4. need more information buddy . An eye-opening lesson, Macy's will disappear from most of these malls, 39-game college football winning streak ends, Kelly Rowland on quarantine life: 'Trying to figure it out', Ex-classmates accuse rising GOP star of harassment, Virginia lawmakers vote to legalize marijuana in 2024. Put new cables for ground and alternator. The book says that you can get nominal output at 1,000 rpm and then at and above 4,000 rpm you 'can' create maximum output. alternator only charges at high rpm, belt and alti.ator both good. On our last anchor out, at idle--800 RPM, the battery monitor shows about a 4 amp loss, and doesn't show neutral (no gain or loss) until about 1,150 RPM. Have you checked for a bad warning light? Once you ve reached the peak alternator rpm, in this case at 4,000 rpm, increased speed doesn t create more power output. When I start it (cold, 1500 rpm) it charges about 14v. An alternator has a normal range of operation. You want a larger alternator pulley in the interest of getting alternator speed down at high rpm. It is also necessary to upgrade the ground side as well. Hi there, my alternator was charging 13.6 sometimes 13.8 at idle, but when at high rpm always when to 13.2 or lower, I changed the alternator and still doing the same, now don't go higher than 13.4 at idle and 12.9 when driving, batteries are 1month old and I am using the alternator … ), and, at the same time, you'll be wearing out your alternator, which costs hundreds of bucks to replace. My 383 has a mild cam and idles well at 550-600 rpm. Hey, The 3 wire internally regulated alternator does not charge the battery when at low RPM. Some alternators retain enough residual magnetism in the rotor to self excite, or generate enough power at a high enough rpm to get the internal exciter feed going, which then enables it to supply full power once it does, but it most likely dies out at low speeds without … does 2010 express have a voltage relay. There are a few variable involved.Namely the size of the battery and its general health. Symptom: You start your car, and the alternator won't charge until you blip the throttle to 3 or 4,000 rpm The issue: Doug Tompsett found some information on it, basically it boils down to the 'exciter wire' not doing it's job. Simple, your alternator is starting to fail. How do you think about the answers? When upgrading to a high output alternator it is important to make sure that the power can get to where it needs to go. ... which should cause your voltage regulator to kick the alternator into high gear. Revs matter, but only to a point. i have a 2012 chevy express van the turn signal brake light and tail light all in one bulb everthing works except tail light socket good fuse good bulb new weird? Followup for those interested. and or possible belt slippage , but to make a true diagnosis more information is needed to your question or what is your real question. All you need to do is run a switched wire to the #1 terminal from the ignition key and it will kick in immediately. Alternator only charges after high RPM reached. i have a 2012 chevy express van the turn signal brake light and tail light all in one bulb everthing works except tail light socket good fuse good bulb new weird? So technically you could say driving in a lower gear would make engine run faster so it could put out more amperage. Only reason I asked on here is because maybe there is some type of alternator/regulator setup that goes up to 18V that I have never heard of before. ... Only 13 left in stock (more on the way). Today I took out the alternator and checked the bushings etc, everything looks ok, except for the small bearing, it’s not 100%. Want Answer 0. Charging systems are normally sized by the car manufacturers to provide at least 120% (when operating at high RPM) of the worst-case OEM (Original Equipment Manufacturer) electrical load. On my way into work this morning the tack dropped to 0 rpm's while the battery light was on, could still take it to 3000 rpm and the tack would work as well as the battery light would go out. The factory charge cable and ground cables were designed to handle only as much amperage as the stock alternator could provide. The wheel turns at 12 RPM. the oem alternator will stand a certain amount of torture charging a bad/weak battery. JavaScript is disabled. 3 Answers. For instance, a 100A alternator has a “rated” output of 100A, which means that it is capable of providing 100A when the alternator shaft is rotating at 6,000 RPM. I noticed that the system doesn't charge unless the engine is running at high r.p.m ... then there is an OPEN diode. yet while the layout is something like ford's, basically grounding the administration twine will make the alternator max out each and all of the time. Then note the voltage reading again and record it. Do the benefits of high output coils only apply to modified and performance engines. The funny thing is that I used to always drive the car at high revs. There are a few things going on here. Question: I have a 2000 Civic EX 2 door coupe. The batt light on dash being on sends a trickle of current down to alt, enough to get exciter to "wake up". to make specific suitable function of the activity cycle from the pcm to the alternator, a scope would be required. The car runs fine. So you ll have a baseline rpm at which max power output can be achieved. The vehicles operates and charges normally unless the rpm gets above a certain point and then the alternator goes offline. On my way into work this morning the tack dropped to 0 rpm's while the battery light was on, could still take it to 3000 rpm and the tack would work as well as the battery light would go out. At idle, 14+V is good. ALTERNATOR SECRETS. Alternator is only putting out 12.5 v under load at idle, if I install a high output alternator will that take care of my problem, battery keeps draining in about a week after having it charged or replaced and has new alternator, or what else could my problem be? Having to rev it sounds like the exciter/regulator is not working as it should. If I just added non-ethanol gas to my car when I usually get regular gas, will that be a problem? it ought to be disabling and overloading the alternator at incorrect cases. Also check the the cable from the alternator to the battery. In some cases that is part of the exciting circuit and if the bulb blows....well there you go. They have to perform some "magic" with internal voltage-drop or rpm detection; and some days, magic just doesn't work, which is why no manufacturer would ever use a 1-wire alternator. ... you’ll need to charge your battery before you can test the alternator. Now the GEN light stays on when idling/low rpm, and goes out at higher RPM. It doesn't vary with RPM much at all, except occasionally shooting up over 16V. The IRS still hasn't processed millions of 2019 tax returns, Report: Missing ex-Notre Dame star found dead, This drug gets you high and is legal ... maybe, Kaley Cuoco recalls moment co-star quit 'Big Bang', 'Example of the American Dream' dies of virus at age 40, Do you know your privilege? Check the reading on the voltmeter again. This indicates poor electrical connections, weak alternator output, excessive current drain from accessories or a defective battery. Start the vehicle and rev the engine to 2,000 RPM. Hi guys, I am working on a school project. Car: 2003 Mazda Protege DX 2.0. $20.95 $ 20. The wheel turns at 12 RPM. Your alternator will not charge until it self generates enough voltage to kick in the field circuit. Rev car up to back out or drive away, and all warnings go out. The alternator went bad, and I replaced it along with the battery. If you want to charge your battery from a dead or low state, you're going to spend $8 on gasoline driving 50 miles to nowhere (actually, you'll spend more if you're driving in low gear at high rpm! Would I be a bad person for driving my car when im pretty sure it has a blown head gasket? alternator only charges at high rpm, belt and alti.ator both good. I removed the alternator and had Autozone and O'Reilly's test it for me. The factory charge cable and ground cables were designed to handle only as much amperage as the stock alternator could provide. When it runs in its normal speed range (about 2000 to 10000 RPM), the voltage regulator that is designed to work with it keeps the output at the proper voltage for charging a 12 volt automotive battery (about 14 or 15 volts). 5. Seems to take a charge still but who knows. Join Yahoo Answers and get 100 points today. Alternators put out a large fraction of their power at relatively low speeds, so you don’t need to drive around at high rpm just to charge up the battery. Have you checked the belt tension? In the last two decades alternators have replaced generators in motor vehicles. This has a standard alternator setup with a built in voltage regulator. That (max output at idle) is unlikely, since alternators produce more current the faster they spin. it ought to be disabling and overloading the alternator at incorrect cases. This is because charging at full pin would overheat the battery, generate high levels of hydrogen gas and dramatically reduce the longevity of the battery. It seems to charge the battery, but then the battery light comes on. Alternator problems and charging system problems can affect your vehicle in different ways. I have a Powerline 120 amp alternator and an Incharge Heart regulator. The rpm signal lead will be in the harness to and will need to be unplugged if you have a tack in your truck. It would barely reach 12.8 volts and then back down to around 11.3 while idling. Alternator charges the battery at a regulated 5 A/h. For a better experience, please enable JavaScript in your browser before proceeding. out of your replace it seems that this is occuring already. Cut the lead to the alternator off of the splice, it is no longer needed. alternator only charges at high rpm, belt and alti.ator both good. Some alternators need to reach something like 1200 rpm before they start charging. I pulled the alternator and replaced the voltage regulator with an old one I had on the shelf (Not sure if it works). I noticed that the system doesn't charge unless the engine is running at high r.p.m.'s. When I blip the throttle, the GEN light goes out … could have very high resistance or a bad cable. In retrospect, the battery most likely overstressed the original alternator. - Hi there, my alternator was charging 13.6 sometimes 13.8 at idle, but when at high rpm always when to 13.2 or lower, I changed the alternator and still doing the same, now don't go higher than 13.4 at idle and 12.9 when driving, batteries are 1month old and I am using the alternator we replaced, 140 amp. System charges at high RPM only ... My '74 T&C won't start without a jump. If it drops to 12V (battery voltage) or rises above 16V, the voltage regulator inside the alternator is bad. I am thinking the alternator will only supply enough volts for the operation of the motor. It could be as simple as that or it could be that there isn’t a problem since it charges fine at higher RPM’s. One-wire alternators are internally MORE complex than 2/3 wire alternators and therefore less reliable. at off, the battery should be between 12.8-14.8. if it doesn't then you may need a new alternator. At high RPM with 100 Amp load at 16 AC Volts produced, internally the alternator may be putting out over 100 Volts, if you were to measure it with no load. Sounds like a crappy regulator or alternator. If we multiply our ratio of 3.16 times the maximum expected engine rpm of 7,000, we get over 22,000 alternator rpm. Just curious, have you ever changed the pulley? It was. I charged the battery over night, started right up. I have an inclined cart mounted on rails moved by a winch. Start car, observe that battery light is still on. does 2010 express have a voltage relay. If voltage is low, go to Step 02 . So I guess that the alternator isn't charging at low rpm. 2010 Chevrolet Express 2500 LT RWD-Maintenance & Repair. Otherwise, have a helper start your car and rev the engine to 1500 RPM. An alternator is generating power at 210 V per phase while running at 1500 rpm. if it is just a curiosity question then the answer would be because of demand . The issue seems to be that the alternator fails to charge it at low rpm. Clicking this will make more experts see … A healthy alternator will power the charging system between 13.5V to 14.5V. Normal Volts Alternator: 14.3-14.5 Amps normal load: 2-4 Amps max load: 14-17 (all electrical equipment on) Symptoms are a little strange. When at idle the alternator is charging very little & will start charging well at 750 rpm & up. Is it an off brand or OEM? If your vest is comfortable at cruise and then you do some start and stop stuff you would feel the temperature increase and decrease. 2 Answers. The reasons are many: output current can be produced at lower rpm, voltage can be more accurately' controlled with solid state regulators, alternators need less maintenance, and they cost less to manufacture. Posted by Anonymous on Dec 24, 2012. Now, unwrap your original harness. It still charges good, 13.6 – 14 v. even if, when you consider which you not have your unique alternator, you in all probability have 2 problems now as maximum aftermarket reman alternators do not artwork good, and in all probability ruined your pcm by skill of now. 2 Answers. At that speed the alternator will not work, so I am also adding a 1:20 gear ratio to turn up the RPMs to about 240. In the past, I could run the engine at 1,000 RPM to charge the batteries while at anchor. With the engine idling it was still only 6v, so the alternator clearly wasn't charging. I am asking because it never used to do this, and did not do this with the Camaro alternator. AUTHOR UNKNOWN - DATE UNKNOWN . System charges at high RPM only Electrical & Ignition. Be sure that the engine is running at a high enough rpm for the charging system to function (especially if running a one-wire alternator excited at a specific rpm). This is 4,000 over our recommended limit of 18,000. The alternator's output capacity is proportional to the RPM of the engine and alternator's temperature. It would only charge slightly when driving at high rpm. An automotive alternator probably needs to run at least 1500 to 2500 RPM. The first is the alternator output rating, which is the amount of current that a unit is capable of producing at a specific rotational speed. You will see where the hot lead that attached to the alternator goes down and meets up with a splice junction of other wires. You must log in or register to reply here. Get your answers by asking now. 95. does 2010 express have a voltage relay. If they don't change the bulb and see if your problem goes away. As the RPM increases, the stray inductance becomes more effective at reducing the output current. The alternator produces power at low RPM (700-1800) but above 1800 rpm it will intermittently charge the battery and or eventually not charge at all above 2300 rpm. If so, how can I fix it? Which tire is the drive wheel on a FWD Ford fusion? The GEN light is on. that alternator is pcm controlled. 2010 Chevrolet Express 2500 LT RWD-Maintenance & Repair. Stock alternators are usually known as a low capacity charge at iddle, hence the reason why along the years charge bulkhead terminals get burnt ( due the high load recharge process when giving throttle PLUS the car power request ). the brushes in the alternator could be worn out, and the diodes have gone bad. Sorta sounds like a Chinanator, not oem bosch or valeo. It charges at a much lower rate than specified on the batteries usually 1/10 of their capacity. what is the difference between tire size 235/55R17 and235/55ZR17? Rev the engine up to 3000 RPM a keep an eye on the meter. even if, when you consider which you not have your unique alternator, you in all probability have 2 problems now as maximum aftermarket reman alternators do not artwork good, and in all probability ruined your pcm by skill of now. there may be nothing wrong with it. You may notice: your ALT or CHARGE indicator light comes on, your engine is hard to start and cranks slowly, or doesn't crank, your battery demands lots of water, your alternator makes noises, or your headlights suddenly go dim. With the engine idling it was still only 6v, so the alternator clearly wasn't charging. I then turn on the lights, turn signal, fan, etc. My as alternator doesn't charge at low rpm let car idle 10 mins runs battery down 69 rr .40 over 11to 1 440 msd 6al new alternator and electric voltage regulator pain in my as Dec 18, 2020 #2 Garngie Well-Known Member Take the alternator to an auto parts store for a free check. 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