[JSeery]

Do you have a wiring diagram? The Yellow wire with the Red tracer is the wire from the Circuit Breaker to the Light Control Switch. The wire you are calling black is actually Black with a Blue tracer and it does from the Circuit Breaker to the interior Pillar Lights. The wire going into the Circuit Breaker should be solid Yellow and comes from the Starter Solenoid.

The Circuit Breaker should be opening up if there is excess current draw in the lighting circuit. It is possible that the points in there are stuck and keeping it from working or that it is providing excess resistance when there is a large current draw. Need to be careful, but you could connect a HEAVY gauge wire jumper between the two Circuit Breaker terminals and see if that fixes the issue. The problem here is that if the problem is not at the Circuit Breaker and you remove it from the circuit, there is no protection for the rest of the circuit wiring. So, you would only want the jumper on there long enough to check it out.