No brake lights on bed. Third brake light working
Try wiggling the hazard light switch while pressing on the brakes.The taillights are connected to the turn signal switch before it goes to the brake switch.The contacts on the hazard switch are probably dirty(I remember this problem years ago,same symptoms-3rd light works but l/R tailights not working).You may just be able to turn the hazards on+off a bunch of times to clean the contacts instead of replacing the switch.
SOURCE: 2001 GMC SIERRA . ABS LIGHT STAYS ON
Wheel speed sensors misadjusted, damaged , or metal shavings and other debree, since they are magnetic can give false readings from one of the wheel circuits. Over sized tires can give of false speed readings as well. there are many other causes including bad relay, control module, e.t.c. It is best to have the proper scan tool to diagnose an ABS problem
SOURCE: Brake lights do not work
This is a well documented problem, replace the turn signal/multifunction switch to correct this issue, this very problem happened on my GMC, it is a 99 as well, replaced the switch as instructed by a chevy forum member and it fixed the problem
SOURCE: 1998 gmc sierra brake lights
did u check that they not burn?if not you should Check the wires going into the steering column if you don't have separate turn signal lights and brake lights because if they use the same bulb then the turn signal may be bad. If I remember correctly that particular car doesn't work this way, but I include it just in case.
SOURCE: how do you remove the third brake light assembly
You'll have to gently apply some prying pressure to the housing as you turn the screws, it sounds like they've stripped the part they go in...
SOURCE: my 1999 gmc sierra's brake lights don't come on
There's a switch at the top of your brake pedal. They wear out, chance are that's the problem, easy fix in the driveway.
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