Wiring Harness, Connectors, Switches, Relays & Breakers | JEGS Wiring can be confusing and frustrating for a lot of automotive enthusiasts. You're in luck. Chances are, JEGS has just the harness or electrical accessory you need to make your electrical job a OBD2 Budget D & B-series Tucked Engine Harness OBD2 Budget D & B-Series Tucked Engine harness MADE IN THE U.S.A. This harness uses Mil-Spec Teflon coated wire with a maximum heat rating of 200°C. Our D-series and B-series compatible wire-tuck engine harness is nearly identical to our Mil-spec engine harness line with the primary difference being, the single black wire color and expandable loom.