Been trying to figure out WTF is going on with Frankenstang's '89 notch, lately. For awhile, it was having a problem where when you flipped on the headlights, the dash lights wouldn't come on and neither would the parking lights on the front/rear, but the headlights DO come on. The brake lights work fine in either case. It used to be that you could simply wiggle the dial on the dashboard dimmer switch or beat on the dash underneath the dimmer and it would make them come on, but now ... nothing. The parking lamps and dash lights NEVER come on at all.
Fuses are all good, and the switch is good because we've swapped it out with two different switches and verified the old switch from the notch even works in her '80 Capri. Headlamp switch is brand new and seems to have no effect upon the situation, nor does the hazard/flasher switch or its connectors.
The dimmer switch and exterior parking lamps are on the same fuse, so something along the line there is kaput. Sooooo ... is there a relay under the dash for this circuit that could be dead, or is it just going to be a matter of chasing wires and looking for a bad ground or loose connection?
This sucks, because the notch was to be her DD once she sold the '04, but with no lights (other than the headlamps, themselves), she can't legally drive the thing at night.
If anyone has a wiring diagram and/or pics showing where all the wiring extends to or ties in with under the dash (I could only trace the wires of the dimmer switch about 6" back until it joins up with that HUGE primary bundle of wires near the kickpanel), that would be awesome.
Fuses are all good, and the switch is good because we've swapped it out with two different switches and verified the old switch from the notch even works in her '80 Capri. Headlamp switch is brand new and seems to have no effect upon the situation, nor does the hazard/flasher switch or its connectors.
The dimmer switch and exterior parking lamps are on the same fuse, so something along the line there is kaput. Sooooo ... is there a relay under the dash for this circuit that could be dead, or is it just going to be a matter of chasing wires and looking for a bad ground or loose connection?
This sucks, because the notch was to be her DD once she sold the '04, but with no lights (other than the headlamps, themselves), she can't legally drive the thing at night.
If anyone has a wiring diagram and/or pics showing where all the wiring extends to or ties in with under the dash (I could only trace the wires of the dimmer switch about 6" back until it joins up with that HUGE primary bundle of wires near the kickpanel), that would be awesome.
Then let's see what Mr. jrichker has for you to take a look at.
Basically, there's a hitch in it that will turn on the parking lamps halfway towards one position, then it shuts those off and turns the headlamps only on in the next position. If you just baaaaaarely hold it just between those two spots, you can get both the headlamps and the parking lamps to come on, which is probably why we were able to bump the dash and make it work before (bad connection within the switch). Stupid, stupid switch!! 
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