Electrical issues.

vpmopar said
My 64 Dart is doing strange things. If I turn on the headlights everything works perfectly including the high beams when you press the dimmer switch, including the indicator on the dash. Turn the key on and the turn signals work perfectly, right and left front and rear and the indicator lights on the dash work correctly as well. with the key on, turn on the left or right signal and it works fine until you turn on the headlights. with the headlights on, all the exterior lights work correctly but both turn signal indicators in the dash will flash and the high beam indicator also will flash. If you hit the dimmer switch, and turn on the left signal the right indicator light on the will flash, and if you put the right signal on. the left indicator will flash, but all the outside light work correctly. Checked all the grounds, traced the wires under the dash and hood. Can't find anything that looks wrong. Used multi-meter to check voltages and found nothing. This issue just started and I don't know why. Replaced headlight switch, dimmer switch and flasher. Can anybody help me? Please.

Quickly reading through, it sounds like crossed wires.
Those wires could be a filament in a dual filiment bulb or something like that.

Since you're willing to do some diagnotics, we should be able to help you find the cause.

Let's start with a circuit diagram.
From that we can see what is related.

When you turn the headlights on, current flows from the battery through the headlight switch and back to ground.
You'll have to tell us whether headlight position also turns on the front parking lights, but it does turn on the rear lights.

So that's situation 1. The ammeter should swing toward discharge to indicate the amount of current flowing out of the battery.