M1045A2 Electrical Issue

[Mattmo714]

I have all the TM's for this truck and can't seem to find the trouble I'm having in any of the troubleshooting sections. When I got this truck, I noticed a black X on the driver side headlight, and upon turning on the headlights, it was in fact out. The passenger side headlight comes on sometimes, but most of the time, it does not. All my gauges work correctly, but the back lighting doesn't work, including the windshield mounted tach. The side marker lights, front and rear running lights and brake lights function normally. When I activate the turn signals, it lights the correct side, both front and rear, but does not flash. I installed a Kascar auxiliary grounding kit, but this did not solve the problem. I'm thinking either a bad relay on the switch itself, or maybe a ground wire into the switch. Anybody have this problem before ? I welcome any opinions you guys have over what the issue may be. Thanks for the help

 

[juanprado]

I would start with swapping the light switch and go from there. Might also have a bad flasher.

 

[Mattmo714]

Thanks Juan. You are correct, the hazard lights on the turn signal column don't work either. I just ordered a new light switch. When I installed the Kascar aux grounding harness, I took the time to sand down each connector and connection point. The only one I might not have gotten very well is the body ground. My truck is not blown apart, so it's a very tight space to work in.

Thanks again,
Matt