m38 wiring harness | eBay www›Search›m38 wiring harnessSave m38 wiring harness to get e-mail alerts and updates on your eBay Feed. + Items in search results. See search results that fit your vehicle. 10 product ratings - Jeep MB GPW M38 NOS Wiring Harness and Fording Tube Clamp Set G-503 G-740. $12. Buy It Now +$4 shipping. 30 Sold 30 Sold. Wiring Harness, Waterproof M38 1950-1951 This is the waterproof wiring harness for M38 models. The harness works with the original 24 volt waterproof connectors. These are USA made. Note: The harness requires the little bullet termials that you must use off your old harness. 1 Required per Jeep.