5 ton electrical problem

[amick]

Ive got a m54a2 with some wiring issues. When I have the headlights off, the turn signals and brake lights work great. However, when I turn the headlights on, the right turn signals work but the left side (front and back) are solid. I have looked for a bad ground but cant find one and I dont know where else to start. Why would the turn signals work fine with the headlights off but then only the left goes bad with the headlights on? I have gone over the wiring diagram but cant figure out where the problem is. Any help would be greatly appreciated.

 

[M813A1]

Have you thought about changingthe 3 lever switch first alot of problems are caused by the switch

 

[Triple C]

I had a similar problem and it turned out there was a wire pinched between the bed and the frame. Guess it took a load to short out. Anyway, cut it off and all the lights except the marker it was going to works. Good luck.

 

[amick]

Thanks for the advice. I tested the leads coming out of the flasher unit. The right side works with headlights on or off. The left side only flashes of the headlights are off. Should I buy a new flasher unit or a turn signal switch?

 

[rrrr]

Check the hazard position to see if both work. If not I would still lean toward a 3 lever light switch problem.