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Old 12-18-2012, 02:30 PM
GMR GMR is offline
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parasitic drain

1931 Ford with sbc 355. I have a 0.054a (54ma) draw from my alternator bat post with the engine off with meter connected in series between alt post and its wire. With engine running and high beams on I get 13.8vdc at idle and 14.5vdc at 1500 rpm. These readings are at the alt post.
With engine running I get .15vac at alt post.

Need some help as I don't know how to pinpoint the problem. I am assuming 54ma is not acceptable.

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Old 12-18-2012, 04:30 PM
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Sounds like a rectifier going bad, passing A/C current and drawing on the battery.
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Old 12-19-2012, 10:02 AM
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Thankyou LATECH.
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Old 12-19-2012, 04:11 PM
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Youre Very welcome....
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Old 12-19-2012, 05:49 PM
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I'd unplug the radio(if you have a newer one) and retest.. as the new radios draw to keep memory of your settings/clock/presets etc..
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