Tail lights and dash lights not working 2000 gmc 3500

SOURCE: Marker lights, tail lights and dash lights do not work

I had a similar nagging problem once, though I do not recall the dashlights being involved. For me, the lines from the brakes went up the steering column to the turn signal. I pulled the wheel and inspected all the connections, and just like that everything worked again. I believe I could have tugged on the wiring harness without pulling hte wheel and obtained the same results.

SOURCE: Tail light problems on 1996 GMC Sierra pickup

I had similar problem with my 97 sierra... I only lost 1 light, then brake lights stayed on all the time... turns out the "t" connector for the trailer harness under rear bumper was rotted inside...unplugged the 2 parts of the harness and pluged them into each other with out the "T" harness.... everything works great... Hope it helps ya

SOURCE: Rear tail light on one side won't work. Fuse is

Sounds like either a short in the wiring or corrosion built up on the contacts in the bulb socket. First try cleaning the contacts in the socket with a wire brush. Look at the wiring for any burnt spots or obvious damage to the insulation on the wires. I would start by insulating the wires with electrical tape as far back from the socket as I could reach and see if that helps. Good luck.

SOURCE: My 2000 GMC Savana Van keeps blowing a fuse that

it sounds like you have a short some were im guessing it's in your tail light were it plugs in check and see if theres any open wireing from the light to about 3to 6 inches away

SOURCE: brake lights won't work. tail lights do. I

need to know if your third brake light up high is working or not.if it isn't,you need to check the brake light switch on the brake pedal with a test light,one side hot all the time,the other side should turn hot when brake pedal is pushed.