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Hello Paul,
i've checked the wiring diagram. I don't think this is caused by the normal headlamp switch in the left of the dash.
If there would be a ground problem this would also affect turn signal and fog lights.
Both headlamps have individual fuses. Sicherung A1 (high beam left) and Sicherung A2 (high beam right). These fuses get their currency via a Terminal 56a. (BS 5/1). If there is a connection problem this would affect both high beam headlamps.
Have you checked the connections and cables high beam switch behind the steering wheel? Any modifications in that area?
The high beam lever can be pushed and pulled. Have you tested both ways?
Have you tested if there is currency running if you push or pull the lever?
Regards from Germany
Markus
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