M37 Wiring Harness - steelsoldiers Nov 30, 2018M37 Wiring Harness. Need someone who can install new wiring harness. Located near Augusta, GA. CH46---David---706-831-6564.M37 wiring optionsFeb 08, 2012M37 - Wiring harness and where it goes..May 25, 2009See more results g741 • View topic - Wiring Diagram - Dodge M37 Jan 28, 2014That goes for both the front and rear harnesses. Some of the differences have to deal with the main light switch, which went from having two wiring plugs on the back to just one, which changed both harnesses. The ORD for the M37 (Not B1) shows 3 harness for the body (based on truck SN) and 3 for the chassis, not counting M43 and other variants.