Electrical Issues after an engine swap

Tiny
JOSH VELEZ
  • MEMBER
  • 1992 MERCURY MARQUIS
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 125,000 MILES
I had an engine swap. My ignition switch was funny to get the key in and out, so my mechanic switched my ignition after the engine swap. Now, my digital dash is semi frozen; the mph stay on 0, the mileage is stuck on the mileage at the time of the engine install, the fuel gauge is up and down rapidly and very inaccurate. Most recently, my wipers started going extremely slow and then stopped working and now my running lights do not work when my lights are on. I checked the fuses under the dash and all are fine. Never had any issues before the engine swap and I was told it might be the computer. Please help
Wednesday, October 26th, 2016 AT 5:51 AM

2 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check battery for condition including load test then check to see if a ground wire is disconnected either to body or engine as sometimes they are left off. See picture also check ground on left front fender apron forward of ECM module. Finally if it still does it then have a mechanic scan for codes and he can verify if it s an ECM or not. The computer for engine does not effect your windshield wipers or any other body function only engine/transmission.
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Wednesday, October 26th, 2016 AT 7:15 AM
Tiny
RENEE L
  • ADMIN
  • 1,260 POSTS
Hi JOSH,

If you decide to check the condition of your battery yourself here is a link to helpful information from this site that features written instructions, pictures and a video explaining how to load test your battery yourself.

If you need further assistance please come back to 2CarPros.com. We are always happy to help.

https://www.2carpros.com/articles/how-to-check-a-car-battery

Thank you for visiting 2CarPros.

Kindest regards,

Renee
Admin
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Wednesday, October 26th, 2016 AT 1:39 PM

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