Headlights on 1977 Cadi Fleetwood Hearse not working.
I crawled under there and saw that the dimmer switch had broken off with the prongs still in the holes to the electrical wiring. I bought a new dimmer switch and installed it and plugged in the wires with no result. What else could it be?
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Have you checked applicable fuses for everything except head lamps? The headlamps themselves don't use a fuse. Check the battery junction block under the hood, one of your positive battery cables should go to junction block. If several fusible links check them. My info shows red wire carries battery voltage to head lamp switch for headlamps. The headlamp switch has two voltage circuits, mainly, one for the head lamps, for the other lamps that the switch controls, those smaller lamps are fuse protected.
Well, you'll have to investigate a little further. It could be anything from a bad switch to a broken power wire or bad ground. Grab your volt meter, pull on the headlights on and measure the voltage at the connectors at the headlights. If you have 12 volts, then it's probably a bad ground, if there is no voltage, then you'll have to start working your way back up the wire harness for the lights until you can find out where you lost the power at, but before anything else,...You did check the fuse under the dash for the headlights, right?
ignition switch. the one in the column where the key goes into. not exactly an easy replacement due to the airbag location as sometimes the mount screrws for the key switch retainer will be between the wheel and the column assembly requiring the wheel to be removed.
Should either be on the under-dash fuse panel or under the edge of the dash near the steering column. To figure out if you are looking at the directional flasher or the four way, turn the hazard flasher on and find that one first. the directional one is identical but will be making no clicking noise.