Battery drain?

1989 CADILLAC DEVILLE
120,000 MILES • 4.6L • V8 • 2WD • AUTOMATIC
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DAVID COSTA2
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?
Apr 27, 2025 at 5:24 PM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,503 POSTS
  • ASE Certified Mechanic
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.
Apr 28, 2025 at 11:44 AM
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