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

Mopar_Parr said

I don’t jump to L8 because there was 12 volts there already, but only when the stop lamp switch was engaged(brakes). The only continuous power to the harness was the L1. I press on the brake and the L8 gets hot,
I release the brake pedal, then there is no voltage at L8. Not sure if ties to turn signal switch with D4A?

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OK That's not right. L8 should always be hot. Power should come from L8 all the time. Key on or off.

D4A does go to the turn signal switch.
If the brake is applied and the turn signals are off, the power through the turn signal switch and to the brake lights.
If the brake is applied and a turn signal is on, that side brake light is disconnected.