The tail lights work until you press the brake. when on the brake there are no lights on at all, no tail no brake no nothing. bulbs are good. replaced the tail light connector plates but that didnt help. also checked to make sure there was power going through the wires and it is, any suggestions on what else it could be? also no fuses out either, thanks
Bad Ground, check to make sure the grd. strap from firewall to engine is not broken and also the firewll to frame ,if one of these is broken or not tight it will cause the prob. you are having, also make sure the connector at the back drivers side where you would plug trailer harness in has a ground there also !
All grounds checked fine in the voltage drop test.
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SOURCE: Brake light dont work. 2006 chevy truck, 4.8L 2wd
Some of these had two fuses for brake lights. One for the top/center stop lamp and another for the rear left and right brake lights. Usually one said "stop" and the other said "brake" and one was in the underhood panel while the other was in the dash fuse panel. It's not uncommon to blow a brake light fuse [LR and RR] if you tow a trailer but some of these had seperate fuses for the trailer lights also. If you have a test light check both sides of the two fuses for power [ignition key on] while stepping on the brakes. It should at lest narrow your search a bit.
SOURCE: Brake lights on my Chevy Silverado do not work but the Cab works
REPLACE THE TURN SIGNAL FLASHER BEHIND THE LEFT SIDE OF THE KNEE BOLSTER.
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