What else could I try for non working back up lights on '97 Yukon besides new bulbs and fuses?
have you checked the reverse lights switch?
What would be the cause of no tail lights and no cluster lights when the fuses and bulbs are working?
The brake lights and tail lights are separate wiring systems. Even some of the bulbs may have two separate bulbs in the same glass housing. If the bulbs are in fact working, then the next step would be to test the brake switch under the dash. When you depress the brake pedal the switch is pushed creating a connection to turn on the brake lights.
Your brakes lights on your 84 cadi Seville are not working the bulbs and fuse are good all other lights are working what can you do next?
1994 Pontiac firebird break stop lights is not working i already replaced all lights bulbs what do i do now?
check the connection there was a corrosion in the connection of my firebird that was stoping all of the bulbs to work and check the ground on the bulbs if that don't work i would have to say start tracing the wires under the carpet for bad wires but dielectric grese is the tail lights best freind after you get them working. Good luck