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M54A1

Early R Mystery Switch

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 I'm cleaning up the previous owner's  wiring in my 71 R685.  There is a switch box on the left side of the dash between the steering wheel and vent window. the switch is broke, and there is a wad of disconnected wires under the dash that look like they went to the switch. What is this switch and what does it do?

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It was a courtesy switch that let you blink the headlights when another truck passed and flash your trailer lights when you were passing.

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