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» Termpro Audio Forum » Component Specific Topics » Alternators, Batteries, Interconnects » Alternator Issues For The Pros

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Author Topic: Alternator Issues For The Pros
TweedleDee
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I have a couple questions:

1) How do you test for ac current coming from your alternator?

2) How much ac should you see?

I put my DMM + lead to the + terminal of my battery and the - lead to the - term of battery and saw 30v ac.

Autozone said my alternator was fine, though it said 42 amps peak @ 13-13.5v for a factory 60 amp alt.
Posts: 126 | From: CA | Registered: Jan 2008  |  IP: Logged | Report this post to a Moderator
TeamSubGoPoof
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you shouldn't have ANY a/c current from the alt...it should be d/c

You need a d/c clamp meter and just throw it on the charging wire.

If they tested just at idle then 42 amps is normal...most factory alts are rated at higher rpms

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Posts: 8274 | From: Russellville AL | Registered: Nov 2002  |  IP: Logged | Report this post to a Moderator
TweedleDee
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they tested @ idle and 2000rpm
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TeamSubGoPoof
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2k engine rpm or 2k alt rpm?

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TweedleDee
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Engine rpm. So probably around 3200 alternator rpm.
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Earthman
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Wow, 30v ac!
Iirc, more than .5volt of AC leakage would mean a bad diode issue in the alt.
Posts: 16 | From: california | Registered: Mar 2008  |  IP: Logged | Report this post to a Moderator
   

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