2010gmcyukon
Full Access Member
I posted this on a gm truck forum earlier, but haven't gotten any response yet. Hoping maybe someone over here might have an idea.
I have at 94 K1500 Truck with an odd rear light issue...
The front lights (headlights, parking lights, blinkers) and dash lights all work as expected.
When my headlight switch is off...the rear lights work as expected:
Here's what I've do so far:
I have at 94 K1500 Truck with an odd rear light issue...
The front lights (headlights, parking lights, blinkers) and dash lights all work as expected.
When my headlight switch is off...the rear lights work as expected:
- Brake lights work
- Blinkers work
- No tail lights
- No brake lights
- No reverse lights
- No blinkers
Here's what I've do so far:
- I checked all the fuses on the panel right under the steering wheel. None are blown.
- I checked all 6 taillight bulbs and they appear good (both filaments).
- I swapped the headlight/parking light switch assembly with another, same result.
- The ground wire on the frame near the back bumper was all rusty. I ground the frame and reattached the wire with new hardware.
- I pulled the plug off the back of the left taillight and hooked a test light to it.
- Hooked the clip to the black wire.
- When the headlight switch is OFF:
- The brake light wire goes positive when hitting the brake.
- The blinker wire flashes positive as expected.
- The taillight wire is off.
- When the headlight switch is ON:
- All of the wires are positive all the time.