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Old Jun 23, 2004 | 02:03 PM
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grantdr1
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Voltage Back Feed

Recently switch motors from a 302 to 400 in 78 F100.
the motor(400) is out of 79 lincoln mark V. according to the part numbers most of the parts are interchangable,
including to voltage regulator, and alternator. But it is
now causing a back feed that is killling batteries. What causing the back feed?? How do I find/fix this???

DRG.
 
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Old Jun 23, 2004 | 02:27 PM
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Back Feed ? or do you mean, battery Drain?
 
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Old Jun 23, 2004 | 03:12 PM
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Try this. Start at the starter relay and pull the small wires loose on the battery connection till you find what makes the light go out.

 
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