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Electrical issues, Brake lights on a 88 n/a

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Old 09-12-08, 12:48 PM
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Electrical issues, Brake lights on a 88 n/a

So I had a short in the right side tail light to the point where the bubbles fused to the harness (caused by a bad weather seal on the tail light that allowed rain to get in). Replaced the harness and light bubbles, and I checked the fuse box, the fuse box is damaged and a new one is on its way. The tail lights still work BTW just not break lights. I turn on the headlight switch, and the taillights light up. Just they don't get brighter when I apply the breaks. However the fuses did not break, it melted, and replacement fuse also melt. I took a Amp fuses kit and cut the hot wire running to the fuse socked to by-pass the damaged fuse box and then ran it back to the the wiring for the break lights. This works for about 20 minutes then the fuse breaks. So I'm trying to figure out what is causing these fuses to go. I don't want to put the new fuse box in and have this short melt out the new fuse box.

1. Its is only the brake lights, tail lights work fine.
2. Damaged fuse box has been by-passed, and been replaced and getting power from the same source as the fuse box, but before it reaches the fuse box.
3. The fuse no longer melts but still breaks.
4. I have not changed the ground wiring in anyway.
5. The waring light that tells me the brake light is out does no longer lights up, as it did before I changed out the harness.


Here is a Paint picture of what I have done.

Where or what does the fuse box draw power from, and could this have been damaged to point where it is sending to much power through to break the fuse/melt the fuse?
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Old 09-12-08, 04:29 PM
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so you are bypassing the CPU? or the fuse box?

The 12 volt goes from the fuse box to the switch, then the switch feeds the CPU then the CPU feeds the idiot lights and the brake lights, which ground in the harness into the car body.

So I am not sure what your drawing is trying to do
Old 09-12-08, 05:55 PM
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I have bypassed the fuse box, as it has been damaged by the short and is melted fuses, The bypass does have a fuse in it to protect the lights, but after about 20 minutes it burns out. Rather then melting.
Old 09-12-08, 09:57 PM
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Originally Posted by {fc}DriftingCanadian13b
I have bypassed the fuse box, as it has been damaged by the short and is melted fuses, The bypass does have a fuse in it to protect the lights, but after about 20 minutes it burns out. Rather then melting.
I know you have said that, but you have failed to say how you have the lights wired.

So you are taking voltage to the switch or to the lights??? Your drawing does not contain a switch or the CPU (both of which are required to make the brake lights work).
Old 09-12-08, 10:23 PM
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The lights are still wired in as if it was stock. The only difference is that the hot wired does not go through the fuse box so all the normal switches, and wiring run that run to the CPU is still being used. I just jumped the fuse box connection to keep it simple, and put in my own fuse rathen using the damaged fuse box. Its just a simple bypass around the damaged fuse box. Basicly just like replacing the entire fuse box, but with just one fuse.

Last edited by {fc}DriftingCanadian13b; 09-12-08 at 10:26 PM.
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