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Old 01-10-2011, 02:11 PM   #2
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Join Date: Dec 2008
Location: Yay Area CA
Posts: 2,329
Re: Where is the Purple Wire for Turn Signals?

There should be no purple on a 71 where a single element bulb is used instead of an 1157 dual element bulb, the brown wire (running lights) serve as a ground for the turn signals and also power for the parking lights. With the head lights on the parking lights will also come on because they will ground through the turn signal circuit but when you hit the turn signal circuit it removes the ground from the park lights and they go off and on as the power is applied and removed by the flasher. With the headlights off the turn signals ground though the headlights. If you want the markers to also flash wire them parallel with the park lights.

If yours doesn't match the above diagram and does use the 1157 bulb the purple wire is brown inside the cab so either way use the brown wire.
1965 GMC shortwide big window
1969 Chevy C20 long (for now)
2005 Silverado 2500HD Crew Cab

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