Battery Dying

Tiny
BRIZE7
  • MEMBER
  • 1986 FORD MUSTANG
I have a 1986 ford mustang gt. Some of the wiring under the hood is a little messed up, but something is draining the battery. Could it be the alternator? Or just a wiring part that needs to be replaced?
Friday, December 31st, 2010 AT 7:15 PM

1 Reply

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 have someone in the car, pull fuses one at a time after each fuse 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! Wait several minutes after hooking up the meter before pulling fuses, test with a good battery!
https://www.2carpros.com/first_things/why_is_my_car_battery_dead_over_night.htm
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Friday, December 31st, 2010 AT 8:02 PM

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