2010 GMC Sierra 1500 SLT 8 Cyl 5.30L
No high beam, taillights, window washer
Within last few days my high beams, taillights, and window washer stopped working. Cant find any bad fuses, relays SEEM to be good(switched with others). Everything else appears to be working as normal. Completely lost on what is causing this.
These 3 circuits are unrelated to each other. If I were there and had to find the cause, the first thing is confirm that there is no 12 volt signal going to the high beam headlight bulb. Remove the bulb from the rear of the headlamp and just access the wires. For example, the right high beam connector has a light green / black wire (or it could be orange) and when you turn the high beams on this wire should illuminate a 12 volt test light if you simply had two defective headlamp bulbs which is not likely - confirm that it DOES NOT and then proceed with the rest of what I am putting here.