This is an important figure due to the fact that OEM alternators are typically ill-equipped to handle additional loads from aftermarket equipment and upgrades. It will work fine at times, then at other times the voltage steadily drops, especially if I turn the lights on. There could be a bad connection or wire that is not too evident. Hope this helps. Hope this helps. Touch the red meter lead to the alternator battery terminal B+. The battery is also brand new. Inspect the wires and connections at the back of the alternator, at the remote voltage regulator (if applicable), and at the battery. I finally got the right one through the VW parts, but it’s still not charging back my battery, and I bought the battery a year and a half ago. Dan Ferrell (author) on October 08, 2019: Check the charging circuit voltage drop. On a 12 volt system the high cutout voltage should be between 14.3 - 14.9 depending on the voltage regulator installed on your alternator. First, measure battery base voltage to make sure you have a fully charged battery. Voltage when up close to 14 according to the gauge. Answer: It's possible. If you're thinking of buying a classic VW Beetle, you need to know a few things beforehand. 2. One is to buy and keep it for years hoping that the price increases, the other is to buy for a low price and flip it for a quick profit. First, make sure the connections are clean and tight, and the cables are good. This other post may help: I have a 1999 jeep cheakee and the alteenate has been tasted and is good but. But remember that the light doesn't always mean there is a bad part; the light may be triggered by a sensor giving a wrong message or there's something wrong with the circuit itself. I drive around with a voltmeter to run these tests the moment it happens, but everything checks out. the truck doesnt die. After replacing it and checking my work, the battery light with a warning "check charging system" comes on. Measure battery voltage across the battery posts with your DMM. Check the voltage drop in the circuit. Question: Can brake fluid ruin the coating of copper wires inside the alternator? 5. This means your battery is fully charged. Hope this helps. Some checks or tests may be suggested as appropriate.1. 2)  Turn on and adjust the carbon pile to alternator-rated amperage output. What’s the cultiprit. Engine Cranks Slowly, Doesn't Crank or Stalls. Check voltage output; also, check the charge circuit voltage drop: Make sure the alternator is properly wired. Starter Circuit Voltage Drop Test (–) Side You can check for a parasitic drain that you may not be aware of. We don't know what it is and have begun looking at the grounding cables and still flying blind trying to solve the issue. But why the headlight go dim with radio off, but with headlamp and AC on (and radio still off?) Question: On my way home, the alternator light came on but made it home fine. Also, the check the engine grounds. Occasionally cylinder 7 and 8 are too lean. I've gone through 5 alternators in about 6 yrs. Check your meter display. Calculating Total Circuit Voltage Drop Powerful, noisy, smelly, rattly. Otherwise, the charging system can't meet the demand and charge your battery. It's possible the vehicle's diagnostic system is causing the light to come on after replacing the battery and/or alternator. (Your battery should have a minimum of 12.4 volts.) Normal charging voltage can vary from 13.5 to 14.5 volts or even higher depending on the battery’s state of charge, temperature and electrical load on the alternator. Apply the parking brake and set the transmission to Neutral (manual transmission) or Park (automatic transmission). I have an ongoing love affair with my VW Golf TDI. I cannot get the wiring connector to snap back into the receptacle on the alternator. If necessary, have the regulator checked. The boosted side will be burning out light bulbs. How about of light is on, but have 24.3 volts at the battery while running, 14.4 volts at the alternator, no dimming of lights or starting complications? “But RC it’s only a 3% voltage drop?” While 3% sounds good, 3% on a voltage limit of 14.4V = 0.43V drop. At home, with the transmission in Neutral or Park, increase engine speed to the same rpm and see if the light comes on. If there's a problem, it could be in the circuit. Sometimes the fusible link, if the circuit has one, is the faulty part. I'd start by checking the alternator and battery fist. Voltmeter (-) test lead to starter B+ post. Question: Just replaced alternator in 2006 Lincoln Mark lt and afternoon driving 2 hrs on the highway the truck faulted out and died at 70 mph. If the problem is not taken care of on time, it can ruin your battery. And I check the dc voltage while the car is running and I'm getting 12.8v. i) Have the alternator and battery checked. Last year at around a 100k miles I replaced the alternator due to regulator failure. A worn belt may slip intermittently, affecting the charging system. To speed up your diagnosis and repair, look up the system condition that most resembles your problem and go over the potential causes described under that condition. Answer: Probably you are dealing with an alternator with worn brushes.
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