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International Automotive Technicians Network
Re: Loss of Communication
Posted to HD/Fleet Forum on 9/16/2018

Forgot the problem, no crank so no start. I am getting Ign power to the C-31 pin on the ECM but the C-70 ground signal never gets sent from the ECM to the ECM and ACT relays. I can trigger those relays by supplying a grd signal to the 85 pins on the relay. no ... Login to read more.