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57rookie · 03-22-2019, 09:32 PM

Update - actually had time to go thru the wiring today.
Cleaning the harness on the LH side fixed the LH outside light.
Moving to the RH side I actually had two issues. Harness was loose so I cut the 3 wires and soldered in a new headlight wire/Harness that I had from another previous project. Then still no LH outer light.
3 lights out of 4, I was making progress.
Because all 4 headlights looked to be fairly new from the original owner I never it took me a while to thing - what if the bulb is bad...
I took the bad light and plugged it into the LH side that was working and no go.
I went and bought a new one and bingo, all 4 headlights working!
I also used a test light for power checks during the above scenario, handy tool that I forget to use more often. Thanks for the advice!

03-22-2019, 09:32 PM	#14
57rookie Registered User Join Date: Jul 2011 Location: Calgary, Alberta Posts: 153	Re: GMC. Hi beam light question Update - actually had time to go thru the wiring today. Cleaning the harness on the LH side fixed the LH outside light. Moving to the RH side I actually had two issues. Harness was loose so I cut the 3 wires and soldered in a new headlight wire/Harness that I had from another previous project. Then still no LH outer light. 3 lights out of 4, I was making progress. Because all 4 headlights looked to be fairly new from the original owner I never it took me a while to thing - what if the bulb is bad... I took the bad light and plugged it into the LH side that was working and no go. I went and bought a new one and bingo, all 4 headlights working! I also used a test light for power checks during the above scenario, handy tool that I forget to use more often. Thanks for the advice!