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  1. E55 ECM bench harness / stand-alone harness

    Cadillac STS Forum 2005 through 2012
    Hey everyone. First Post here. I have an 05 STS with the dreaded E55 ECM. Long story short I built a bench harness for it following the ECM pins for GM LAN Bus +/-, IGN Volt (all 3 of them) switched, Battery+ (12V) and Ground (Screw on the ecm enclsoure). I’m using a 12V 1A power supply and...