My Battery maybe weak it sits at like 11.9 to 11.6 volts until it starts to charge. Hyundai - Accent :: Alternator Doesn't Start Charging Battery Until Engine Is Revved A Couple Times Dec 9, 2015. 940 alternator won't charge battery until engine is revved Jump to Latest maintenance & nonperformance The current is not adjustable, so always full power until the batteries … It was almost like the 2 regulators were fighting each other. Ive got no battery light when I turn on the ignition, and when I start the car the alternator does not charge unless I rev the engine to about 2000 rpm, where upon it continues charging whatever the RPM until I shut it down. After I connected it, I charged the batteries until they were at 13.5 V. I started the truck and let it run for about 20 minutes. In turn, the alternator needs to replenish the battery and provide the power for the vehicle loads through the charging cables and connections. If you ever figure out why that is let me know. Took the battery to an auto parts store and it tested good. If the street is too narrow to carry the current, it shows … The test indicated that the alternator was not charging at all. and it's not the voltmeter as the source of the problem. Look into doing a later model ZX, or turbo ZX, alternator swap. I get all different codes untill It starts to charge . In some cars, the charging system voltage might go up to as high as 15 Volts. I also don't know which systems have safety connections to the air system and will not begin to function until adequate pressure is built. Dim lights. It has its own ground post which we grounded to the battery. I start up the S2 and the battery light stays on, volts read very low and alternator not charging. With the car running, even revved up a little, it doesn't show that it is charging the battery. Once the voltage regulator turns on, the alternator will remain on and charging until the engine comes to a complete stop. There should be a charge indicator somewhere that is … Battery voltage after sitting for an hour: 12.4 volts, including after I start the engine. It’s hard to tell whether or not an alternator works if you don’t know what to look for. Since the alternator … Joined: Jul 10, 2007 Oddometer: 364 Location: Queens, NY. It is probably safest to assume that any particular alternator is not fitted with one, so never disconnect the alternator, battery, or switch a master switch whilst the engine is running – you have been warned. 12.5V is ok for the battery. It is possible your idle revs are too low. Battery … I have been told Bosch alternators are notorious for this. The alternator is powered by several different wiring mechanisms. Our custom built 1 wire tractor alternator for 12V systems is your life savor not to mention, time savor because, with our alternator there is no need to rev up the throttle to get the alternator to charge. After I put in a new alternator (old one had bad bearings) it would not start charging until the engine was revved to about 2500 rpm. it has done this for the last few years but was the least of my worries. After that it's fine until started again. Hi all, Just got myself a 2006 Fabia Estate 1.9 TDI. My bus is still pretty much OEM regarding the charging system for the chassis batteries. I changed my alternator after replacing the fusable link . if that is disconnected, or not connected tightly, the alternator will not work until the engine is revved up to about 3000. once the engine hits 3000 RPMs the alternator energizes itself and begins to charge. 2. If they're all working properly, but get dim, more than likely it's your voltage regulator or alternator going bad. It doesn't start charging until I rev it up to about 3000 or so rpm. engine runs good and idles well. About 2 weeks ago I was getting the same "battery not charging" message, and after removing the alternator to get it tested, I noticed the negative cable was very slightly loose, so I tightened it and the problem seemed to go away until today. it has done this for the last few years but was the least of my worries. please IMHO, I would do what the others say. You need to check the charging output from the alternator. The batteries only showed 12.3 V. I even drove back to advanced auto and had them check the system again. the red wire at connector is also hot . until i rev the motor the cab light as well as the headlights are dim. ok I know its not charging till 3000 RPM because my SAFC has a voltage gauge on it. Re: Battery doesn't start to charge until engine has been revved Reply #8 – Monday, Jul 27, 2020, 06:01 AM Most if not all big chain parts store will test alternators for free. The warning light circuit. I check it with a vot meter and it reads 12.1 or so Discussion in 'GS Boxers' started by cyrilgrey, Oct 7, 2016. cyrilgrey, Oct 7, 2016 #1. cyrilgrey Been here awhile. The easiest way to test it is by using a voltmeter. If the engine idle speed and pulley ratio combination do not … Occasionally the surge quench diode (when fitted) works, but destroys itself in so doing. The battery needs to deliver its available power to the starter through the cables and connections for cranking the engine. 35A load. In some modern cars, the alternator is not charging constantly, but rather comes on and off as commanded by the computer (PCM) as a fuel-saving measure. My alternator does not begin charging until the bike hits a certain rpm, about 3k, where it kicks in. Inexpensive and great insurance. If the alternator is not getting any power, it cannot turn the pulley and belt mechanism that charges the battery, and the battery will not charge. If its not putting out 13V+ then the battery isn't getting charged. and it's not the voltmeter as the source of the problem. The Orion should run the lithium bank via the starter battery with a constant current of min. Alternators are rated by max amps, at idle they're noticeably lower. But the last time i had this problem i changed the alternator and it fixed it. SOURCE: brand new battery and alternator two possibilities that immediately come to my mind from past experience: (1) check that 2-connector plug on the side of the alternator! Brushes etc, and tested.
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