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Re: COP with 3 wires..what is the 3rd wire doing and why?
Posted to Technical Theory Forum on 3/8/2002

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If the coil is a transformer, the secondary needs a ground connection. I think this is the case in Fiat Marea 5 cyl. with Motronic 2.10.4 ECM, for exemple. In the Fiat the ICM is internal to the ECM. ... Login to read more.