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Re: 2011 Maxxforce 7.6 intake heater help
Posted to HD/Fleet Forum on 1/6/2018 1 Reply

Rich is right. Pin 1 on relay connector is grounded all the time. Pin 2 from pin 59 on black ECM is a high or hot side signal controlled by the ECM. Relay in turns sends batt volt to grid. Power for grids probably comes right from B+ post on battery. Might hav... Login to read more.

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