I used another MacGuyver wire to make BOTH stoplights work. Basically, this is a 3-bulb turn-brake/marker/BO marker tail lamp. The way it was wired was for right side BO stop, left side service stop. The way we wired it, both service markers run off the same lead but each brake had its own line, the left side brake didn't come on. So I made a wire to jumper the BO brake into the service brake at the trailer connection socket
Now, this means the BO brake light will also illuminate the service brake lights, this is more of a safety feature than anything else since inadvertent use of the BO switch won't kill the service brake lights...hey, that is a SAFETY FEATURE.
Since the hydraulic brake line switch is inop., I used the bare switch leads as the switch while MKC observed. I love it when a plan comes together
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On the drive home, I had lots to think about with regards to the turn signals. It makes sense, sort of. Using the service brake lights as turn signals, BOTH must go through the flasher relay system so when braking and indicating a turn, the turn bulb flashes while the brake is steady on. Such is the logic in the flasher relay.
MKC discovered the end of the turn signal stalk is the pilot light, showing activation of the turn signals. It was covered with that nasty, stinky green paint. We got it cleaned off...one more step closer to perfection.