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Old 05-28-2011, 10:52 PM   #47
BMW_Knight
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Join Date: Sep 2004
Location: Maryland
Posts: 1,963
My Ride: STG2 ZHP,E70 X5(DD)
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Yes a relay works well. Tap into the blue and yellow wire for the reverse positive signal. Use a 4 prong relay and use the switching prongs between pin 17 and ground. Also ground the actual ground of the relay.

Works like a charm.
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