Question about 1983 Ford F150

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Drains power and shuts off while in motion, new battery and alt

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Check the voltage on the battery connectors with a multimeter, while engine is running. You must see at least 13.5 V DC.
If not, you alternator is not charging. If yes, you have a short circuit somewhere and a big one, or some tremendous power consumption, ( car audio, amplifier, you know better).

Posted on Sep 08, 2010

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From my experience, id almost always go tot he power antenna first. This things always break stick bind etc and when they do they cause a nasty battery drain.

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You likely have a intermittent / poor ground connection somewhere in the power system.
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