Hi I changed my GTred tail light to a cobra ambar tail light 99-01 I cut the under dash wire to the rear stop light. then I took the stop light from the third light. All light work percfect just the signal light blink so fast. Do I have toche a module o relay? THANKS
Change the blinker relay switch to a different one. You already altered the voltage being supplied by the new lights so be prepared to encounter new problems if do not switch back to the original set up.
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Sounds like the previous owner patched a hot wire to the rear lights instead of fixing the problem. Someone will need to get the factory wiring diagrams and start backtracking from the lights to the dash to find out what is wrong. You may need a shop manual to get the diagrams you will need. Most repair books do not go into wiring that deep for the DIY.
If only your brake light in middle of rear window works then your other bulbs are bad. If brake lights all work in the back than bulbs are good. If you put turn signal on right or left and the bulbs light in front and back then you need to change multifunction light control box under dash. My understanding is it cost $600 new. So I would try used.
check the wiring from the tailights back to the fuse panel, it sounds like an open connection. if i recall correctly check under the dash on the drivers side near the fuse panel for a bunch of wires in a bundle and look carefully for a wire or two that are cut/shorted/or seperated, you can also check under the drivers side kick panel by the hood release.
If this vehicle has a trailer harness, that could be the problem; it could be shorted out. Additionally, if there is no trailer harness, look under the truck bed at the rear, look for a grey wiring connector that wires come out of, and run to the taillamps. I have observed corrrosion in this connector, which will result in a short circuit. You may find it necessary to cut the connector out and resplice the wires back together (eliminate the connector), if severe corrosion is indeed present.
Bad ground....and possibly a bad flasher module........stop lamp fuse........corroded wiring between the cab and the tail lights........If your truck has trailer light wiring check to see that it isn't causing the problem.........most after market kits plug into the main plug under the rear of the truck and over time can corrode and create bad connections hope this helps....good luck!