When dash lights failed on my 82 300Sd, turn-turn-turn of dimmer knob got back very weak illumination. So, pulled cluster and when 30+ y.o. soldering iron failed, cut approx 1" scrap off new bicycle brake cable, pried up each of the brass strips just enough to insert an end. This solderless jumper "cable" quick fix worked fine. Could eventually corrode, but should last for years. Don

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John 5:25