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1993 Ford F350 Batteries run down

Tiny
#1 56FAN
  • MEMBER
  • 1993 FORD F-350
  • V8
  • 2WD
  • MANUAL
  • 180,000 MILES
I charge my batteries and the truck starts fine. When the truck sits for 1 1/2 days or so the batteries are dead again. I put on all new cables and have checked to see that no accy's are left on. I do have an ignition switch that is a little sloppy but don't know if that could be the problem.
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Thursday, June 5th, 2008 AT 2:14 PM

2 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Get an analog voltmeter remove the negative battery cable, attach the Black lead to the battery post, Red lead to cable end, then pull fuses one at a time, make sure there are no accessories or lights in the on position, Key off! Close the door after each fuse and check meter, when you pull the fuse for the bad curcuit, the meter will drop to 1 volt or so. Check all fuses, even under the hood. If meter does not drop, remove the battery connection from the alternator, if it drops now, the diodes are bad in the alternator. Put the fuse back in were it goes as you go so you don't forget which fuse goes were!
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Thursday, June 5th, 2008 AT 2:25 PM
Tiny
#1 56FAN
  • MEMBER
  • 2 POSTS
Thank you. I'll try it right now.
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Thursday, June 5th, 2008 AT 2:42 PM

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