Vehicle:
1999 (OBS) GMC K2500 7.4L
Stereo:
Pioneer DMH-WT8600NEX
1. Grounds are all good.
2. Fuses are all good.
3. Dimmer switch still fully operational.
4. Electrical signal to relevant fuses are good.
5. Used Metri-Pack GT150 to replace harness (correctly hooked up)
6. Originally tied...