According to the Detroit Iron Factory Shop Manual CD,(factory wiring schematic) the purple wire goes to the 2 connections that are side by side. Not the 2 that are angled and side by side. It also says that the DarkGreen and the LightGreen wires goes to the back-up lights. Hope this helps?
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 1970 GMC LWB, Fleetside, 350/4spd, Flowmaster "40's", 2002 GMC 16" Rallies, cowl hood,and added a bunch of options that weren't there when I started.
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