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GMC Forum: stop light fuse blows out
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Old 08-21-2019, 05:55 PM
stonefly stonefly is offline
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Drives a GMC Truck
 
Join Date: Aug 2019
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Default stop light fuse blows out

15 amp stop light fuse blows out.

I'm working on my neighbor's GMC 4X4 pickup. Brake light switch is removed and sitting on the floor of the cab. Orange wire is cut. Taillights are removed. Wire harness is unplugged at rear of truck.

I plug in fuse. I use screwdriver to cause brake light switch to move to pedal depress position. I touch the ends of the orange wire. I hear a faint noise as I touch and separate the wire ends. I twist ends of orange wire together.

Now comes the strange part. When I pull the fuse, it blows. The fuse doesn't blow until I pull it out. Just as I grip and pull, it blows out.

Hazard lights work. Directionals work. They do not cause fuse to blow. Only the brake causes the fuse to blow.

My neighbor told me that the fuse would blow out instantly when he stepped on the brake pedal. However, when I was troubleshooting I noticed the above strange scenario. The fuse doesn't appear to blow out until I attempt to unplug it.
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