The good news is that replacing a factory alternator with a high output alternator, in and of itself, isnt going to damage the rest of the electronics in your car, even if the new alternator is much, much bigger than the old one. Make sure your ride performs well in all the right places with a new cost-efficient BMW X5 alternator from AutoZone. Battery voltage with engine off 12.5 Running = 14.9 so alternator seems to work but a little high. 2. More than about 1/10 volt says there's a "grounding" issue. If the voltage is not within range, move on to the next step below. A new alternator has an output that falls between 13.5 and 14.8 volts, which means it powers all of your car's electrical components while taking strain off the battery. Comments: i have a 2004 bmw 325 xi and i am replacing the alternator would 120 voltage be the alternator to buy? The voltage should not be below 13.5 volts, which means you have a weak alternator, and over 14.5 volts is overcharging. This test BYPASSES the regulator (after all, it IS disconnected! Some alternators are "single wire"(not counting the frame ground) and produce around 14.5 volts at their output terminal , assuming there's not much voltage drop between there and the battery. Alternator Specs MFR VALEO / VOLTAGE 12 / AMPERAGE 250 / ROTATION CW / PULLEY DESIGN 7 Groove / PULLEY GROOVE OD 50.2 / Cross Reference: BMW 12 31 8 611 280, 12 31 8 636 418, 8611280, 8636418, Valeo CG20U012, 439964,4 40720, 2621784A; Other 21084, 208-1212 Genuine BMW June 8, 2015 : Followup from the Pelican Staff: you mean amperage? 14.8V is considered overcharging. Heavy duty high voltage automotive diodes in a large heat sink on a high temperature printed circuit board - what this means for you is consistent charging, long life, and a minimum of fuss. 1. Give our parts specialists a call at 1-888-280-7799. Is 14.8 volts too high? Just buy the correct part number for your vehicle. Measure voltage between alternator frame and battery's negative terminal. A bad regulator Check charging system wires. Voltage Regulator, Genuine BMW - E82 128i, E9X 328i/335i, E60 528i/535i, X3, X5 3.0si The most-common failure on an alternator can be replaced on its own. You need to match the one that comes out. Don't have the engine at high rpm very long, as the voltage might rise to over 15 volts, cooking the battery. When your test shows a steady or intermittent high or low voltage output, the voltage regulator is possibly bad. However, before going any further, check that all the connections to the alternator and battery are good and clean as described in the next section. A bad alternator wire or corroded 12.3v is the voltage of the battery, that alternator isnt getting ANYTHING to the battery if thats what its showing while the car is running. You may have blown a fuse inline with the alternator. ), and the alternator should put out whatever maximum it can. Thinking it might be the voltage regulator but I looked at the back of the alternator and I didn't see an external regulator. Voltage with lights, fan etc on 13.9. Most voltage regulators fail by allowing a high voltage output, though. Omega Diode Board $90. Allows easy conversion to 280 watt alternators on Slash 5 models 1970-73, as well as the high output Omega 600.

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