No problem Mac, let us know when you want to return to the steering column. Regarding the electrical problems, it certainly sounds like you have issues with the twin filament lights in the system - running/brakes, running/signal and signal/brakes. I assume that you also have similar issues if you try to use the hazard lights because they use the same filament as the signals/brakes. I also assume that you did not have any problems with your TS switch installation since you mention the same problems existed prior to that.
Not sure what you have already done, I would start with 4 fresh double filament bulbs, should be 1157's at all four corners for the signals/brakes. While changing out the bulbs give careful inspection to the condition of the sockets. Make sure they're clean, no rust or corrosion and the bulbs fit properly. I also like to use dielectric grease when I replace bulbs to prevent future corrosion. Once you're bulbs and sockets are good to go, I would then check out the ground wires. Most of the electrical issues I've dealt with on these cars have been supposed repairs gone wrong or bad grounds. All of your problems deal with the double filament bulbs and only when you try to light the second filament. Since those bulbs and sockets share a common ground, I would go there first. As your are doing your inspection, keep and eye out for splices, non-factory connectors and black taped wires.
According to the assembly manual, each pair of tail lights has a ground wire coming out of the main harness that connects to the backside of the lamp housing then jumpers to the other housing. I would check those four connections first. Make sure they are clean of grime and rust and have the proper washers installed. On the front end, it looks like there is a single ground connection located by the horn. Two other ground connections to be aware of that may be part of your problem are the braided ground strap from the birdcage to the frame near the left front body mount and the steering column rag joint. The braided strap grounds most of the dash connections back to the frame and the rag joint grounds the steering column to the fame via the steering box.
As you check/clean each ground, try your lights to see if there is any change. You can also make up a jumper wire with a pair of alligator clips that is long enough to jump back to the main battery ground. I do this to bypass any suspect ground wire or connection to make sure I have a good ground before moving on.
Download a copy of the '72 wiring harness if you haven't already done so, there is a link from the Adam's Apple post in the main electrical section. Keep your eyes open for any wire labeled black that is connected to the lighting system and look for grounds I may have missed. Good luck and let us know what you find !!
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John Sigmund
valkman57@sbcglobal.net
NCRS Member 61302
NW NCRS Chapter Member
Duct tape is the new Black !!