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1986 Ford F-150 Battery Power Drain

Tiny
JB21585
  • MEMBER
  • 1986 FORD F-150
Electrical problem
1986 Ford F150 6 cyl Two Wheel Drive Manual 140K miles

I have a 1986 Ford F150 and have found that the battery is losing charge. I have replaced the battery twice and have had the alternator tested and passed. When I replaced the battery it seemed to run and start fine for about a week and a half and now has no charge to start it. It will push start. Could there be a short in the alternator? Is it a bad starter solenoid? Do I have to test all the wires in the vehicle? Any insight would be greatly appreciated, I just bought the truck and it has been nothing but headaches. Thank you!
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Friday, November 7th, 2008 AT 11:48 PM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there.

You can do a current draw test, place an amp meter between the battery Pos & the cable, check the current draw with key off and doors closed. If you have a current draw above about.15 Amps, start pulling fuses one at a time to isolate the faulty circuit, remember the radio will have a small draw for the memory, try this test.

Mark (mhpautos)
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Saturday, November 8th, 2008 AT 1:09 AM

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