StevieMac said

I have a 70 Duster that is just giving me fits with some of the electrical. Simply put, I am not an electrician and I am trying to figure this out....

When I pull the light switch out, I get headlights, but no tail lights or dash lights. If I turn the knob, the dome doesn't come on either. If I press the brakes, the brake lights come on, passenger side dimmer though. If I put it into reverse, no back up lights. Before I take the dash apart, would a lose ground wire in the trunk be causing all of this? I'm looking for the ground on the tail light assembly, but can't find hour it. It has to be there somewhere....

Any advice is greatly appreciated

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67Dart273 said

PLEASE PAY ATTENTION, already posted above^^ The headlights and the tail lights HAVE SEPARATE POWER SOURCES

The tail/ park/ instrument lamps come from a fuse

The headlights are fed to a separate contact come from the splice in the black ammeter wire

You need a diagram. Go to MyMopar and download the closes shop manual and the aftermarket diagram. Very first step is to see if the fuse has power

View attachment 1715337050

You can see tail circuit is fuse marked "E". This supplies tail/ park/ instrument and I think cigar lighter. It should be hot at all times.

After this circuit fuse feeds the instrument lamp dimmer, that power goes through the far right fuse marked inst and feeds all dash lamps with orange wiring. THAT FUSE then is only hot

1...If the tail fuse is good and working
2....If the light switch is in "park" or "head"
3....and the dimmer control twisted somewhat to left

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