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Old 06-12-2018, 12:54 PM
kk88rrc kk88rrc is offline
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Join Date: Mar 2007
Location: Portland Maine
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Hey...
As the title says brand new alternator is not charging at idle. I get a reading around 11.5v at idle and will climb to 14.4v by 1500rpm. Before I pull it and bring it to be bench tested, is there anything else to check? Would a grounding issue cause this? Belt is tight. Alternator is the 140amp model from BP Utah.

One other note with the ignition on & engine off the speakers have a very noticeable whine. Seems to go away with engine running or at leasts gets drowned out.

Thanks!
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Old 06-12-2018, 02:02 PM
p m p m is offline
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Almost sounds like one or more of the diodes are burned.

OTOH, it is almost a predictable behavior for an alternator modified for higher output current.
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Old 06-12-2018, 02:23 PM
kk88rrc kk88rrc is offline
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Another observation while testing. With ignition on engine off, the alternator hums and goes away when charge light wire is unplugged.
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