03 GT is Mine Again; Electrical Issues Need Fixing - Mustang Evolution

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Old 04-18-2016, 01:20 PM   #1
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03 GT is Mine Again; Electrical Issues Need Fixing

So to keep it simple, my 2003 GT that was supposed to have been sold to my friend ended up never going through the sale, so the car is mine again. Looks like that Mach 1 will have to wait. In the meantime, I wish to take care of the electrical issues.

One night while driving on the highway, my car started smoking into the cabin badly. Long story short, the wiring to the tag lights caught fire and burnt themselves out, thankfully not taking the trunk lid, let alone the entire car with it. That said, as it sits, I've unplugged the harness to the trunk to prevent it catching anything else on fire. At the time, I bought the LED bulbs off LMR to replace the old faded bulbs in the tag lights.

Since this incident, the driver's side window motor doesn't work now, even though I replaced the window motor within the last year (I still get a clicking noise when I press the switch). The passenger side window works normally. On top of this, the reverse lights don't come on, and I believe to the fuse for this keeps popping, for I discovered the fuse for the circuit was bad, and upon replacement, the lights still didn't turn on. I should note this is not the first time I've replaced that fuse.

What in the world do I need to do in order to diagnose/track down these issues and fix them? I don't know a whole lot about electrical, and I'm not sure where would be the first place to look. Obviously I need to replace the tag light pigtail wiring and tag light bulbs, but what about the window motor and the popping reverse light fuse? Any help would be immensely appreciated 😁


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2014 Ford Focus ST (ST3, Tuxedo Black Metallic)
1997 Ford Mustang GT (Rio Red) (RMR #7832)

2003 Ford Mustang GT Centennial Edition (Black) (SOLD)
2004 Ford Mustang GT (Redfire) (SOLD)
1985 Chevrolet C10 Custom Deluxe (Red) (SOLD)
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Old 04-18-2016, 02:18 PM   #2
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A popping fuse with all of the other issues you have described is possibly a bare wire grounding and shorting out.

I doubt there is going to be an easy answer. You need to chase and check the wiring throughout the car. You may find two undhielded wires touching, or a broken wire or shield touching metal.

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Old 04-19-2016, 07:45 PM   #3
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Get a wire diagram , multimeter , and start chasing wires , checking relays.
Buy a fuse block tester , or relay tester so you don't have to keep buying fuses.
Sounds like somewhere in the harness it's getting high resistance, even grounding out to the body.
My bet is a wire is broken or split , and touching the body.
Good luck

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Old 04-19-2016, 08:24 PM   #4
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I would start from the burnt license plate harness and work your way back from there.
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Old 04-29-2016, 09:19 AM   #5
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Welp I figured it all out. There were two wires in the trunk harness shorting out. I was able to get a new harness off my friend and replaced it. Everything works!!


"Jig"
2014 Ford Focus ST (ST3, Tuxedo Black Metallic)
2003 Ford Mustang GT Centennial Edition (Black)
1985 Chevrolet C10 Custom Deluxe (Red)
2004 Ford Mustang GT (Redfire) (SOLD)
1997 Ford Mustang GT (Rio Red) (SOLD)
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1997 Ford Mustang GT (Rio Red) (RMR #7832)

2003 Ford Mustang GT Centennial Edition (Black) (SOLD)
2004 Ford Mustang GT (Redfire) (SOLD)
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Old 04-29-2016, 12:57 PM   #6
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I'm glad to hear it was a simple repair.

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Old 04-29-2016, 01:04 PM   #7
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That's great news! Glad it was fairly easy, that's not usually the case chasing electrical problems.

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