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Have a problem with my 78. The tail lights stopped working overnight. New headlight switch, TS switch, cleaned grounds, good fuses and good bulbs did not help. The rear blinkers and brake lights do work however. Its essentially the opposite in the front. Parking lights and marker lights work, but the flashers do not. What say ye?
I say that electrical situations are the worst. I have little input for ya, but hope you figure it out! I had to clean all my sockets on my 78 Bronco with some steal wool/sand paper when I got it to sort out most of my issues. The last thing that was a problem was my brake lights not coming on, but that was just a fuse, everything else at the time was working fine.
Have a problem with my 78. The tail lights stopped working overnight. New headlight switch, TS switch, cleaned grounds, good fuses and good bulbs did not help. The rear blinkers and brake lights do work however. Its essentially the opposite in the front. Parking lights and marker lights work, but the flashers do not. What say ye?
There are TWO different flashers. Both are round with two prongs, but the 4 way flasher is a H/D unit, as it has a louder CLICK.
T/S flasher plugs into the back of the instrument cluster. See parts catalog pic for location of the 4 way flasher.
Basics... have you tried to figure out (like with a test light or multimeter) whether you have current to the right wires? No current is one set of problems, current but no workee is a different set.
Hmmm, if I was faced with those symptoms, I'd probably start at the front sockets. Turn on the hazards or a directional, and probe the socket. Then backprobe the flasher bulb filament's wires in the first connector coming from that socket, and work your way back to the switch. And check continuity from your ground points to whatever they're supposed to ground.
So how did it work with the old switch? At all? Worst scenario I can think of is that some PO swapped in an incorrect wire harness somewhere.
I hate to say it, but go back and double-check your pin placements in the TS switch connector. This just sounds like the kind of crazy stuff that happens when a wire is in the wrong spot - more explainable than the crazy stuff which occurs due to a missing ground... Guess yours is different with the automatic, but I wouldn't be surprised if all of the MT wires are in the same positions on an AT switch, with the PRND21 lamp added to an empty pin position. Is the gear indicator lighting up?
Here's my MT switch:
And here you can see where a couple of the wires on my new switch are a slightly different color from the ones in the original:
Those greens are different! The old switch uses lime/olive green wires and the bright green wires. The new one uses the bright green in both runs, leading to potential confusion. There is a stripe on one of them to differentiate them, but easy to overlook with old eyes...
At the tail light end, I would probe the wires from those sockets up to the switch. The brake lamp circuit should run to the brighter filament in the bulb, while the dim filament should come on with the head/parking lamps. I suppose it could've been backwards, and toasted the brighter filaments already - are you using suckvania bulbs? I find their headlights to be complete garbage.
My guess is that either there's a wire or two in the wrong positions at the TS switch, or something is crossed up leading back to your tail lamps. The second scenario might cause a ground to be lost somewhere. Is/was there any nasty trailer wiring?
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