Battery drain?

Tiny
DAVID COSTA2
  • MEMBER
  • 1989 CADILLAC DEVILLE
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
I have narrowed the drains down to 3 wires. There is a power distro block on the firewall with several wires. There are 2 orange wires that are on the same crimp connector. They go through the firewall near the interior Fusebox. I pulled all of the fuses one at a time and the drain remained. Beforehand, I removed the courtesy light fuse. The other wire with a draw is also orange and goes through the firewall behind the glove box. I'm guessing this is the ECM/BCM feed. Can anyone help me identify what these wires feed?
Sunday, April 27th, 2025 AT 5:24 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
It is tough to know what you are talking about as far as the wiring goes, this guide is good for finding a battery drain:

https://www.2carpros.com/articles/car-battery-dead-overnight

Can you remove the wiring connectors from the ECM/BCM and does the drain go away? Is the battery new? Please go over this guide and get back to us.
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Monday, April 28th, 2025 AT 11:44 AM

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