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reverse lights

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I have a 71 Chevelle that had a standard transmission and now has an automatic turbo 400. I need to know what color the wires are under the dash for the reverse lights. I want to be able to mechanically turn the switch on by turning the column. What are the purple and the purple/black wire for? They are tied together so I was guessing that they were some kind of neutral safty switch.

Thanks for your help,

Scott [email protected]