Body Builder Wiring Diagrams | Mack Trucks Always check the latest information at the “Wiring Diagrams” location. Utilization of Body Builder connectors ordered and provided by Mack is strongly recommended as your power, lighting, and ground source for body installation, PTO installation, and operation. Cutting into wiring harnesses is not recommended as it may affect CAN Bus messaging.Manuals · Mack Trucks mack wiring harness | eBay www›Search›mack wiring harnessNEW EOM MACK WIRING HARNESS 20931696 See more like this. Mack WIRING HARNESS 3543*H2493* Other Parts. Brand New. $76. Buy It Now Genuine Volvo / Mack Truck Headlight Wiring Harness #22047659 See more like this. NOS Mack truck Wire harness 41MR4296. New (Other) $30. or Best Offer +$10 shipping.