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v70 alternator -- sound in engine compartment V70-XC70

posted by  jablackburn on  Sun Dec 13 18:11 CST 2009
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last visit: Thu Jan 20 10:56 CST 2011
[RELATED]

Strain it. Turn on every electrical thing you can think of in the car, then test the voltage across the terminals. Do your lights dim a lot with things like the heater turned on, power windows, etc? If you're still getting a reading in the high 13's-14, your alternator is just fine...for now anyway. If it drops to around 12 or 13, it's probably on its way out.

I've been trying to track down a similar noise with my mother's Honda that I've been driving for a month now until I go home for Christmas. It has an annoying whine in the morning that isn't the alternator, and it disappears entirely for the next day until the engine is cold again.






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