Parasitic Drain found, how to test more to narrow the problem?

Tiny
SHERRERA
  • MEMBER
  • 2000 FORD CROWN VICTORIA
  • V8
  • 2WD
  • AUTOMATIC
  • 240,000 MILES
I have run a parasitic drain test on my car and found that it was the #7 fuse that controls: Power door locks, power seats, and trunk release lid. All of these are working, but I don't know how to test them further to see which one is causing the drain on my battery.
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Friday, May 6th, 2022 AT 6:26 PM

3 Replies

Tiny
STEVE W.
  • EXPERT
Is it Fuse 7 or circuit breaker 7, they are two different things. These are the diagrams for both. Fuse 7 is only hot when the key is on or in run, as such if it has power when the key is off there is a problem farther up the chain. If it is circuit breaker 7 then you can trace the wires to the listed connectors and disconnect them one at a time until the draw stops.

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

To see what is happening you can place a test light in the circuit in place of the CB or fuse. When you find the connector that is causing the problem, the light will go out or at least dim a lot.
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Friday, May 6th, 2022 AT 8:32 PM
Tiny
SHERRERA
  • MEMBER
Fuse 7 I'm assuming based on the attached photo. I did not know there was a difference. Based on this photo which process should I take, and is there any way you could dumb down the process?
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Monday, May 9th, 2022 AT 6:11 AM
Tiny
STEVE W.
  • EXPERT
That is the circuit breaker. Note the 20A- CB tag. That means it is the first diagram. Out of all the items on the diagram I would look at which options you have. I would also try the door module as the first item to test, it's the most likely to have internal problems that could cause it to stay on. Test wise about the only way is to access the connection to the door module and unplug it while you monitor the draw and see if it goes away.
How did you do the initial testing to find the draw and how much of a draw is it?
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Monday, May 9th, 2022 AT 9:09 AM

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