2.5L, Whining from alternator? - Jeep Wrangler Forum

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Old 12-04-2012, 05:52 AM
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Location: Odenton, MD
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mgh488 is on a distinguished road
2.5L, Whining from alternator?

Sunday I accidently left the keys in the ignition with the battery on, battery dies. No biggy jump it yesterday. After I jump it the slight whining noise now sounds like a turbo. I checked all over the engine, belts etc. and it seems to be coming from the alternator side. Could it be the alternator. Before there was a slight whistle but now its a heck of alot louder. Any thoughts?
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Old 12-04-2012, 06:10 AM   #2
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tangofox007 is on a distinguished road
A failed alternator diode will cause a whine.

Using the alternator to charge a dead battery sometimes has its consequences.
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