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Old 02-06-2013, 02:55 PM
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Location: Long Beach,CA
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Quote:
Originally Posted by bradley6 View Post
Wheatfield (or anyone else, as well):

Could a bad alternator diode cause battery drain when the engine is NOT running?

Thanks to everyone for the GP relay advice; when I get around to testing the alt I will unplug and see if there's any improvement.

If not, set your meter to Volts AC and you should have a reading of ~100mVAC.
If the VAC is too high, then look for a rectifying diode failure.

I have not read all of the threads so this could be a reapeat of inf.
I don't recall you saying your Charging Light was on when you Battery is not charging.

If when you first turn your Key on your Charging Warning Light (all of the warning Lights are suppsed to turn on) dors not go on there is a chance that the Warning Light Bulb is burned out.
Without a 2 Watt Light Bulb in the circuit to excite the Alternator to charge it is not going to work right.
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