So my 1978 K30 started having break light issues after not driving the truck for a while. I had no break lights although my break light switch had power. I checked my grounds and found a few bad ones but still didn’t fix the problem. So as I didn’t really have time for pulling her apart I ran a jumper off the switch and tried to just bypass the problem. But when I looked at my wiring to the rear of the truck I discovered that chevys seem to combine the left and right turn signal wires to get a break light. So I made a splice to them and got break lights, but now I had no turn signals, so I installed sum inline diodes which gave me my turn signals back and brake lights but they will not work together. So now basically I hit my breaks and the turn signal does not work on the rear, the relay clicks but no signal. So now I’m stumped, any advice?
Mike
Mike