power drain
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Freshman User
Joined: Jul 2003
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power drain
91 f-150 just started draing batteryreplaced battery with new one. checked all electrial circuits i knowhow to. drains battery over night but worse when damp/snowy conditions 4.9 l6 auto,air. if i disconnect battery is ok overnight any help? or suggestions
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Joined: Jan 2001
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From: Virginia
power drain
Go buy a test light, and hook one end to the battery positive post, and the other end to the battery positive cable after you have taken the positive cable off the battery. Current flow from the mystery load will flow through the test light, making it glow bright. Then I would start at the starter relay on the fender. You should see a big mass of wires there, one of which comes from the alternator output. Take this wire off and see if the test light goes dim. If it does, then there is something wrong with your alternator. If it stays bright, go inside and pull each fuse one at a time. Hopefully you will find a fuse that makes the test light go dim. This will be the circuit where the problem is, so at least you will have it narrowed down that far.
New User
Joined: Jan 2008
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power drain
I guess you didn't see this thread a few threads down?
https://www.ford-trucks.com/forums/s...hreadid=131818
https://www.ford-trucks.com/forums/s...hreadid=131818
