Parasitic battery drain with engine off and on

Tiny
BDOSD13
  • MEMBER
  • 2007 FORD MUSTANG
  • 4.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 95,000 MILES
I’m trying to find a parasitic short which completely drains the battery within a few hours. This car had a leak under the dash on passenger side and soaked the fuse panel as well as the computer underneath it. The owner told me that his radio wouldn’t shut off and numerous other electrical problems as well. He just purchased this car and before I took a look I told him it could possibly be the ignition switch. The short is catastrophe to all the new batteries he’s put in the car. They will not last one evening just sitting in the parking lot. I took apart the fuse box and removed the once to clean all fuses and terminals. I’m most likely going to have to replace the relays as well. I cannot find a wiring diagram which would expedite this whole mess. I have all the diagnostic tools and meters necessary as I used to work on cars for a living. I know there’s no way you could diagnose this electrical problem without seeing the components that were affected. I would like to know where or who carries the wiring diagrams for this car listed above, convertible, base line trim and features. Thanks for any on-site you could provide me to get this mess underway. I don’t even know if the computer is salvageable or the fuse panel as well.
Saturday, February 6th, 2021 AT 3:07 PM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,640 POSTS
Hi,

I would be happy to provide what I have as far as schematics. Is there a certain area you are looking for? I attached the power distribution schematics below. Let me know if they help or if you need something other.

https://www.2carpros.com/articles/how-to-check-wiring

Let me know.

Take care and God Bless,

Joe
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Saturday, February 6th, 2021 AT 5:38 PM
Tiny
AL514
  • MECHANIC
  • 4,632 POSTS
Hello, I'm just curious, what technique are you using for the draw? It must be a substantial amount of amps. Have you tried the fuse voltage drop method? I use both that and an amp clamp method. Thermal camera is very helpful too.
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Saturday, February 6th, 2021 AT 5:48 PM

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