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. How many volts is the alternator charging? In the last two decades alternators have replaced generators in motor vehicles. If so, how can I fix it? Also check the the cable from the alternator to the battery. My 383 has a mild cam and idles well at 550-600 rpm. Posted by Anonymous on Dec 24, 2012. Join Yahoo Answers and get 100 points today. Start car, observe that battery light is still on. So turn your ignition on and carefully check to make sure all the alternator warning lights illuminate. Feb 4, 2018 #1. More Buying Choices $69.96 (2 new offers) Would I be a bad person for driving my car when im pretty sure it has a blown head gasket? 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. I would like to install an alternator on one of the cart axis, so I can charge a 12V car battery - 20Ah. Revs matter, but only to a point. 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. 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. You may not have a problem. to make specific suitable function of the activity cycle from the pcm to the alternator, a scope would be required. ALTERNATOR SECRETS. If the alternator was working fine in the other vehicle, have the battery tested if necessary. The wheel turns at 12 RPM. The rpm signal lead will be in the harness to and will need to be unplugged if you have a tack in your truck. 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. 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. 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. what is the difference between tire size 235/55R17 and235/55ZR17? That (max output at idle) is unlikely, since alternators produce more current the faster they spin. In some cases that is part of the exciting circuit and if the bulb blows....well there you go. It was. Just curious, have you ever changed the pulley? 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. Each alternator has a design amp output (at spec voltage) versus rotor rotation speed. alternator only charges at high rpm, belt and alti.ator both good. ), and, at the same time, you'll be wearing out your alternator, which costs hundreds of bucks to replace. Which tire is the drive wheel on a FWD Ford fusion? 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. 2 Answers. I tested the battery voltage and it was 6v! Start the engine and slowly increase the speed to 1,500 RPM 6. Followup for those interested. The vehicles operates and charges normally unless the rpm gets above a certain point and then the alternator goes offline. 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. Start the vehicle and rev the engine to 2,000 RPM. I would like to install an alternator on one of the cart axis, so I can charge a 12V car battery - 20Ah. Alternator charges the battery at a regulated 5 A/h. It charges at a much lower rate than specified on the batteries usually 1/10 of their capacity. *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. The GEN light is on. You want a larger alternator pulley in the interest of getting alternator speed down at high rpm. A small car alternator is rated about a 60 amps maximum. 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. 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). It is also necessary to upgrade the ground side as well. An alternator has a normal range of operation. Check voltage at battery, and verify that it is not charging (about 11.5V while car is running with lights on, etc.). 2010 Chevrolet Express 2500 LT RWD-Maintenance & Repair. Now, unwrap your original harness. ... you’ll need to charge your battery before you can test the alternator. The minimum RPM is highly dependent on the specification of alternator. 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. I am working on a school project. Question: I have a 2000 Civic EX 2 door coupe. Sorta sounds like a Chinanator, not oem bosch or valeo. I already replaced the voltage regulator but still no luck. 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. I noticed that the system doesn't charge unless the engine is running at high r.p.m.'s. 4.3 out of 5 stars 11. The factory charge cable and ground cables were designed to handle only as much amperage as the stock alternator could provide. If they don't change the bulb and see if your problem goes away. 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. The car runs fine. Keep VAF Going Donate methods Point your camera app here to donate fast. 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. The funny thing is that I used to always drive the car at high revs. 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. An alternator is generating power at 210 V per phase while running at 1500 rpm. It would only charge slightly when driving at high rpm. that alternator is pcm controlled. the oem alternator will stand a certain amount of torture charging a bad/weak battery. Efficiency peaks at around 3000rpm, ie 50 amps, and will only give small increases over this, regardless of the rpm. You would know this already know this if if you had a $20.00 multi-tester. 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). 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. 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 Still have questions? $20.95 $ 20. if it is just a curiosity question then the answer would be because of demand . Take the alternator to an auto parts store for a free check. The Alternator is directly connected to the engine crankshaft through belts & pulleys (in a car, motorcycle differs). Your alternator will not charge until it self generates enough voltage to kick in the field circuit. 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. Weird behaviour, I can only assume something is loose inside the regulator, or the regulator is starting to break down. This indicates poor electrical connections, weak alternator output, excessive current drain from accessories or a defective battery. 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. I removed the alternator and had Autozone and O'Reilly's test it for me. If it drops to 12V (battery voltage) or rises above 16V, the voltage regulator inside the alternator is bad. could have very high resistance or a bad cable. JavaScript is disabled. Have you checked the belt tension? I am asking because it never used to do this, and did not do this with the Camaro alternator. 4. If your vest is comfortable at cruise and then you do some start and stop stuff you would feel the temperature increase and decrease. 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. Check the alternator drive belt to make sure it's tight. Normal alternator charging voltage is between 13.5 -14.2 volts. ... which should cause your voltage regulator to kick the alternator into high gear. Do the benefits of high output coils only apply to modified and performance engines. I put everything back together and installed the alternator in the car. In the past, I could run the engine at 1,000 RPM to charge the batteries while at anchor. I install a new a alternator but is not charging at higthrpm only charges at low rpm ,what could be my problem? I took the connector off the alternator to make sure voltage was appearing at the two input leads. INTRODUCTION. Is it an off brand or OEM? This has a standard alternator setup with a built in voltage regulator. System charges at high RPM only ... My '74 T&C won't start without a jump. Hi guys, I am working on a school project. 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 … Rev the engine up to 3000 RPM a keep an eye on the meter. Alternator problems and charging system problems can affect your vehicle in different ways. year make . Some alternators need to reach something like 1200 rpm before they start charging. Sounds like a faulty alternator (VR flaky). Rev car up to back out or drive away, and all warnings go out. Get your answers by asking now. How bad does wind have to be to knock out power? Simple, your alternator is starting to fail. 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 … Car: 2003 Mazda Protege DX 2.0. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. If voltage is low, go to Step 02 . 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? When at idle the alternator is charging very little & will start charging well at 750 rpm & up. You must log in or register to reply here. So you ll have a baseline rpm at which max power output can be achieved. … 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. does 2010 express have a voltage relay. 3 Answers. So 600 engine rpm idle would yield 1560 and 1680 alternator RPM respectively. Alternator not charging at high rpm on 87 Volvo 740. Check the reading on the voltmeter again. Have you checked for a bad warning light? For a better experience, please enable JavaScript in your browser before proceeding. If you’re going to spin your Chevy small-block to 7,500 rpm, that’s 22,500 rpm alternator speed. 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? 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! At idle, 14+V is good. 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. So this is gonna be my 3rd post about alternators.. and just looking for some advice. I have an inclined cart mounted on rails moved by a winch. I can always up my idle speed but am looking at another option. Each alternator has a design amp output (at spec voltage) versus rotor rotation speed. op has already stated that the alt light comes on. This is 4,000 over our recommended limit of 18,000. need more information buddy . Having to rev it sounds like the exciter/regulator is not working as it should. Today I took out the alternator and checked the bushings etc, everything looks ok, except for the small bearing, it’s not 100%. However the output of your alternator is controlled by the voltage regulator. Otherwise, have a helper start your car and rev the engine to 1500 RPM. An automotive alternator probably needs to run at least 1500 to 2500 RPM. is it a good battery? The alternator went bad, and I replaced it along with the battery. 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. 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. 3 Answers. It still charges good, 13.6 – 14 v. Want Answer 0. alternator only charges at high rpm, belt and alti.ator both good. out of your replace it seems that this is occuring already. ... Only 13 left in stock (more on the way). Thread starter greiswig; Start date Dec 31, 2012; G. greiswig Member. Do you have a warranty on the one you bought? At about 2000 rpm the alternator produces about half this maximum, so at engine idle the alternator is charging well. A healthy alternator will power the charging system between 13.5V to 14.5V. 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. After that, higher rpm can produce slightly higher amperage output. There are a few things going on here. It seems to charge the battery, but then the battery light comes on. The battery is less than a year old. 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? 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.