Replaced the rear brake light assemblies and cleaned up the rats nest wiring from a previous owner. Have the old wiring diagram. Not missing any wires and ran a new ground.

Wiring is one of the topics most discussed here, either the factory, the chassis builder, time or a PO has messed it up.

Did you get yours in good stead?

would this apply???

https://www.barthmobile.com/eve...191083962#1191083962

Topic was supposed to be cab lights. I think it may be the rocker switch on the dash.

quote:

Originally posted by Barth_Vader:
Topic was supposed to be cab lights. I think it may be the rocker switch on the dash.

That is a very likely guess! Mine was fried and jumpered around when I got the 86. Before I replaced my 24+ clearance and tail light bulbs with LED, I measured over 10 amps current. After LEDs it is a little over 2 amps. New switch will last forever.

quote:

Originally posted by Barth_Vader:
I think it may be the rocker switch on the dash.

Use Steve VW's suggestion and lighten up the amp draw with LED lights. Then change the rocker switch on the dash.