What should I check if my brake lights don't work other than the bulbs?

The bulbs are fine and they only stopped working after I installed headers, cat, catback.. I don't know what it could be other than a fuse, what should I check?? What is the fuse labeled as?


PLEASE HELP

 

check in fuse panel for fuse labeled taillight or T/L or tail

 

Well it's not the fuse, i can't get to the switch and the bulbs are fine.. I'm stumped.. Are there any other connectors that could have came loose throughout the car?

 

well, somewhere from the stop haz fuse 20A should be orange wire that connects to the brake switch (maybe the brake switch is bad??) which conncts to the 3rd brake light by a yellow wire and the brake lights with a light blue wire. maybe this helps?

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91 camaro rs w/t-tops, 5sp, open element K&N 14X3, K&N filter top, dual flows, mallory ign, AR 89-92 camaro big block hood w/functional hood scoop and cowl induction, new dark red glittery paint, z-28 grill, z-28 rims, funky circular corvette tail light fiberglass piece and taillights (came with car, ugh), 4th gen front seats, bottom potion of my backseat (not bolted in, just laying there), pioneer 1.5din cd player, blaupunkt 6x9s and 4x6s, some other various mods as well.
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future mods include either a 383 or a big block w/blower, 12 bolt rear, posi, 3.73 gears, trac bars, new rims and tires, even newer 4th gen seats (all of them), all windows tinted, 6sp, 2 12" subs and a good amp (already have a nice custom camaro box), paint the funky circular fiberglass piece!
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previous car was an '82 camaro berlinetta w/sunroof and w/355, 3sp, shift kit, msd ignition, edlebrock performer carb/manifold, dual flows, 14x3 k&n open element, headers, new dark midnight blue paint, 14" grand prix rims and tires, 3.73 gears, posi rear

 

The switch is fine, the bulbs are new, the fuse is fine..

I'm thinking either the wires got cut somehow or the ground is bad, where are the bulbs grounded at?

 

well, look at the brake light and should be 3 wires going in/out of the unit, a brown wire, light blue wire, and a black wire. the unit is grounded by the black wire and all the lights (including brake light) are grounded also by the brown wire.

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91 camaro rs w/t-tops, 5sp, open element K&N 14X3, K&N filter top, dual flows, mallory ign, AR 89-92 camaro big block hood w/functional hood scoop and cowl induction, new dark red glittery paint, z-28 grill, z-28 rims, funky circular corvette tail light fiberglass piece and taillights (came with car, ugh), 4th gen front seats, bottom potion of my backseat (not bolted in, just laying there), pioneer 1.5din cd player, blaupunkt 6x9s and 4x6s, some other various mods as well.
-
future mods include either a 383 or a big block w/blower, 12 bolt rear, posi, 3.73 gears, trac bars, new rims and tires, even newer 4th gen seats (all of them), all windows tinted, 6sp, 2 12" subs and a good amp (already have a nice custom camaro box), paint the funky circular fiberglass piece!
-
previous car was an '82 camaro berlinetta w/sunroof and w/355, 3sp, shift kit, msd ignition, edlebrock performer carb/manifold, dual flows, 14x3 k&n open element, headers, new dark midnight blue paint, 14" grand prix rims and tires, 3.73 gears, posi rear

 

It was the harness behind the 'glove box'. It was only partially connected, I pushed it back in and they all work again..


Thanks guys