battery drains overnight

2001 FORD F-250
300,000 MILES • 7.3L • 4WD
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CRAIGCOX57
  • MEMBER
  • 1 POST
new battery's relay gp and relay fuel heater and relay starter and drains out overnight.
Sep 28, 2021 at 4:14 PM
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MASTER ASE TECH
  • CERTIFIED EXPERT
  • 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
Sep 29, 2021 at 12:58 PM