My dad recently passed away and left me his truck. He knew alot about cars and kept it in great shape. My tailights recently stoped working. The brake and reverse lights work though.

The most common problem is the brake light switch located up under the dash and mounted just slightly forward of the brake pedal, the other problem is in the IC board in the taillight housings. I'm betting on a bad switch.

Do the front parking lights work? If not, could be a bad headlight switch. With the brake and reverse lights working you're getting power back there. What about the rear license plate lights. Are they working? Check where the rear light harness plugs into the body harness. You'll have to get under the back of the truck. Check that you have power coming from the body harness using a 12 volt DC test light. See if you can get a factory shop manual for your truck as well. It will have wiring diagrams and many other useful instructions to help keep your truck running for years to come. HTH. -Jim

as usual...the main system ground is corroded...undo the lug off the MAIN ground connection and wirebrush it and the spot where it connects....this is that fat ole- Battery Cable...the black one...key to electrical health of all components~....get a NEW battery if this one is older than five years old~

fyi..gm has sections of harnesses running under the truck and when it gets back to the rear it splits right behind the drivers side rear wheel.. tail lights, brake lights, trailer hitch ect... not sure if its snowing where you are at but I have seen snow pile up back there and disconnect or corrode where they connect. hope this helps