It is a bit fiddly but not that hard to run another wire through the yoke tube.
But no two TB20s have the same wiring anyway, ex factory
So finally I figured out the wires for the clock are only for controlling the clock lighting. The voltage regulation of
9.7 to 0 volts takes place via the voltage controller RADIO LIGHT. No other cables found, a great pity! Unfortunately it wasn’t child’s play.
I would open the whole yoke assembly and look for more wires. Then check the fuse.
The Wiring Diagram says it must be connected over fuses panel
I need 12V (board voltage) on my left steering wheel.
I thought this would be child’s play as there are the wires for the clock. I opened the clock cover and found the cables.
I checked the fuse panel and clock fuses, everything was fine, but no voltage at the steering wheel. Unfortunately , I couldn’t figure out the cause. The wiring Diagram has no answer and all main switches were on. Is there someone who has experienced the same.
Thomas