[jancelet]

Here it is, you can see it is #4 battery. Also, Passenger Tail Wires. Getting constant 6V on middle wire (yellow) with lights and Key OFF. When brake applied (with lights and key off) the break light comes on and then middle yellow wire jumps to like 7-8v. Again, both break lights and turn signals come on when KEY And LIGHTS are OFF. When KEY is ON and Lights OFF, both back turn signals work.

ONLY Driver side break and turn signal comes on when BOTH key AND lights are on.

Something is occurring when LIGHTS are ON, AND NOT at other times, that is stopping the brake and signal from WORKING.

The Madjax system has 2 yellow wires from the Lights ON switch
1) separates into 2 colors - does not join 2 lines, but rather is divided into 2 colors, right before 12 pin connector, BLUE (going to the Front HEADLIGHT) AND Brown going to 12 pin connector
2) splices into and joins BLUE that goes into the 12 pin connector

If you drive and engage the break, turn off LIGHTS but leave KEY ON, the break lights turn off after 30 seconds, but turn off LIGHTS and KEY to OFF break lights go off immediately