67 Dart Conv. - No Tail Lights, Park Lights, Flashers

Mattax said
Did you note how much current the ammeter was showing when you did this?
and

this?

If volts go to zero at point of measurement, and the ammeter shows discharge, then current is flowing and there is a short or connection to ground before the point of Voltage measuremnt. The ammeter scale is roughly 40 amps at full discharge and 0 in center. Estimate based on that.

I will check this. What would cause the L8 to loose all voltage

Mattax said
View attachment 1716207703

Here's the top view with the dust and water shield removed.

So you measured on the supply side of the fuses.
View attachment 1716207768

I will check this and report back, yes I measured on the supply side. L8 powers M1(Left front door automatic switch) the door switch and back to the D terminal throught M2? What would cause L8 to loose power when shutting the door? Thanks again for the help on all this.