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Depends on when Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Thu, 26 Jul 2007 18:59:24
In Reply to: low voltage ?, bmacb  [Profile/Gallery]
, Thu, 26 Jul 2007 12:30:23
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I assume the engine is running, and that the engine speed is above idle. A couple of things here-
First, the EDU isn't a precision device. I've seen quite a range of voltages displayed compared to the actual battery voltage. As an example, I've got one car where the EDU reads 0.4 volts lower than the voltage measured at the battery terminals. If you're really worried, slap a voltmeter on the battery terminals at idle and compare it to the EDU reading. And it'll amaze and worry the seller.
Also - how hot was the car? As underhood temperatures rise, the alternator voltage decreases (on purpose) to keep from boiling the battery. So when a cold car is first started and driven, the voltage will be higher - after it has run for a while, or sat and heat-soaked - the voltage will be lower.
It won't be the battery - when the engine is running, all the power is supplied by the alternator. If the voltage is indeed running at the low 13 range, then the problem is most likely worn alternator brushes (part of the Voltage Regulator), not a bad alternator. At the most it could be scored alternator commutator, which would require replacing the alternator. But I'd bet on the VR.
posted by 75.25.4...
, Thu, 26 Jul 2007 12:30:23, Thu, 26 Jul 2007 18:59:24 <-- Viewing This Message
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