Battery drains overnight

Tiny
CRAIGCOX57
  • MEMBER
  • 2001 FORD F-250
  • 7.3L
  • 4WD
  • 300,000 MILES
New battery's relay gp and relay fuel heater and relay starter and drains out overnight.
Tuesday, September 28th, 2021 AT 4:14 PM

1 Reply

Tiny
MASTER ASE TECH
  • MEMBER
  • 82 POSTS
Hi, I'm Dan.

I've attached a repair guide for battery drain. The best advice I can give is to go slow and test every circuit one by one until you find it. Hooking a test light on the battery terminal like in the repair guide and pulling each fuse one by one is the best method.
I've also attached the procedure from Ford for the parasitic battery drain test.

https://www.2carpros.com/articles/car-battery-dead-overnight
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Wednesday, September 29th, 2021 AT 12:58 PM

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