patrick66
Old Man with a Hat
This is on my '69 D300 (hey, electrons are electrons!). I wired up new taillights on my truck not long after I got it. Recently, my project became streetable, and this is when I found out I had rear lighting problems.
The stock wiring harness is intact and uncut. Using the FSM for the truck, I ran the lights to the correct wires in the harness, and initially had all but brake lights. Found out the factory brake light switch plunger was busted, so I replaced that switch. Now, all of the taillight functions were working. Great thing!
Now, the brake lights and running lights in the rear ONLY operate apparently when they feel like it. My turn signals and hazards work fine, and have not failed to do so. The brake lights and taillights work on a purely random basis (when the circuits are applied, it's really a 50/50 shot at function!). I am using normal incadescent bulbs throughout - no LED or weird aftermarket glow lights.
The wires are fine, and the brake switch is new and correct. The taillights are basically trailer light assemblies that are fully functional. Fuses are fine, as the lights DO work when they decide to. All of the front lights work upon application - headlights hi/lo, grille and fender turnsignals and the grille parking lights.
I've gone back and looked at the wiring connections at the lights, as that is the only place I can think where there is (or could be) a problem. No change.
So...ideas? Where am I missing the cause?
The stock wiring harness is intact and uncut. Using the FSM for the truck, I ran the lights to the correct wires in the harness, and initially had all but brake lights. Found out the factory brake light switch plunger was busted, so I replaced that switch. Now, all of the taillight functions were working. Great thing!
Now, the brake lights and running lights in the rear ONLY operate apparently when they feel like it. My turn signals and hazards work fine, and have not failed to do so. The brake lights and taillights work on a purely random basis (when the circuits are applied, it's really a 50/50 shot at function!). I am using normal incadescent bulbs throughout - no LED or weird aftermarket glow lights.
The wires are fine, and the brake switch is new and correct. The taillights are basically trailer light assemblies that are fully functional. Fuses are fine, as the lights DO work when they decide to. All of the front lights work upon application - headlights hi/lo, grille and fender turnsignals and the grille parking lights.
I've gone back and looked at the wiring connections at the lights, as that is the only place I can think where there is (or could be) a problem. No change.
So...ideas? Where am I missing the cause?