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« on: November 08, 2021, 04:32:18 PM »
Take this for for what it's worth.
I was chasing major electrical gremlins correcting the wiring in my 70 BOSS and, assuming the wiring is similar, I learned 2 things:
Everything goes thru the headlight switch AND
everything else goes thru the flasher/turn-signal indicator... with some going thru BOTH.
I replaced both and ALL problems I didn't create myself were GONE..!!!?? like magic.
One of my switches was flakey (intermittent) and the other was defective (broken). This assumes, of course, that you have all wires connected and grounded properly and with proper loads from operating incandescent bulbs, etc.... Don't forget the flashers! (There are 2; 1 for the blinkers and 1 for the E-flashers.)
These 2 switches ARE together the "brain" that routes virtually all the lighting signals. In today's vehicles, it's a computer but back then, it was 2 complexes of switches and re-routed wiring with double feeds, etc... Just look in the manual or wiring diagram of ALL the circuits that route thru them. I was shocked. The headlamp switch even has a circuit breaker built in that "breaks" when too much current is drawn and it overheats the circuit (the only difference between the 69 vs 70 is that CB...and the 69 rating is higher bcz it has 4 headlight vs 2). After the CB cools off for a while, everything works again "until next time". You can't imagine how maddening that can be when troubleshooting... I wanted to pull my hair out!!
Luckily, I had, all the manuals, tools, an electrician and a lot of beer/time. Oh yeah, I worked on computers for 38 years so I was not gonna let some 1970s "technology" defeat me..!!!
OK, there, I feel better now. Hope this helps..!!