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...but it's taken me a little while to get to the repair.
Hoo boy. Didn't need a mirror to see the problem. Both wires were bare right up at the switch and also downstream a few inches.
While examining the wires I noticed a possible contributing factor, i.e. the flexible coupling disc was disintegrating. Which explains the vibration I was feeling at 20-25 mph and the occasional bad shudder upon takeoff from a complete stop.
Since I had also been meaning to remedy a leaking rear crank seal I dropped the transmission, fixed the wiring with shrink wrap and replaced the defective disc and leaky seal.
I also noticed that the reverse light switch from an early gearbox that I have was not as long overall as the one on the M47 so I decided to use it to keep the mended wires a little further away from the inside of the tunnel. About 1/8" to 3/16" maybe. I figured every little bit helps.
Wouldn't you know, when all was said and done the car no longer leaked oil or shuddered at low speed but dammit, the back up lights wouldn't come on.
I cursed myself for not testing the switch and then I remembered I hadn't replaced fuse 12.
New fuse. Lights work. Car is happy and so am I.
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'80 DL 2 door, '89 DL Wagon
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Fault tracing electrical problems: Not my forte [200]