American Autowire even includes a screwdriver for the Highway 22 Plus fuse panel terminals.When selecting a wiring harness, several considerations must be kept in mind. Arguably the most important is the number of circuits required, which depends on the electrical accessories equipped in the vehicle. However, it’s essential to consider future additions to the electrical system and plan for them. Not all circuits need to be utilized until necessary; for example, adding air conditioning later will be easier if a circuit is available to power it.
This crude circuit tester was made from an old trailer clearance light, scraps of wire, and alligator clips. It was used to verify whether there was a drain on the battery.Another aspect to consider is the basic design of the harness. There are three primary types. Some kits have all the wires attached to the fuse panel, and the wires are then routed to the loads being powered, cut to length, and connected. The second style of harness has wires running from the loads, which are cut to length and then connected to the fuse panel. Finally, exact replacement factory harnesses are terminated on both ends, although some plugs may need to be installed.
With all electrical devices turned off, our tester was connected between the positive battery terminal and the battery cable. The glowing bulbs indicated that current was flowing somewhere it shouldn’t be

For our application, we chose American Autowire’s Highway 22 Plus system, which can supply all the electronics-dependent items our Dodge will be equipped with. The fuse panel includes an LED flasher, a horn relay, and a preinstalled relay for accessory circuits triggered by 12 V or a ground circuit. A preinstalled 20-amp relay can function as either a keyed 12V or ground-triggered item, and backup light feed and power wires are included. The 20-amp wiper circuit will support all aftermarket wiper systems, and the heater-A/C power source is connected to an accessory circuit to eliminate the draw from the blower motor while the vehicle is starting.


After removing the instrument cluster, the source of the electrical problem was discovered. Several wires with melted insulation leading to a courtesy light were found behind the dashboard. If left unrepaired, the car could have burned to the ground.Installing a replacement wiring harness in an older car can prevent a multitude of problems, enhance safety and reliability, and allow for the addition of modern electrical accessories. We will show you how to ensure all the connections our Dodge needs to function well next time.