Test trailer wiring harness multimeter

See part checking lighting system with an ohm meter. How to isolate one circuit from the system to get an accurate reading. You will need to have someone sit in the truck and run through each function while you test the pins.

In order to determine the configuration on the trailer side, you will have to trace the wiring back from each pin. While checking the connectors if you notice any corrosion .

Test brake lights, left and right turn signals, hazards and reverse lights.

Take note of which bulbs are not working.

Remove the lens cover on the light or lights that are not working with a . We have written this to make it easy for anyone to understand and test trailer lights. Feel free to print this document and wiring diagrams to take them out in the shop or driveway to help you find and fix the problem. There are full page plug and receptacle diagrams located at the end of this document. Set the multimeter in ohm mode. Put one of the leads in the ground pin and the other lead in any of the other pins.

The reading will not go to zero because of the resistance in the wire. Replace the plug on the Jeep side. Shave down the new plug until it connects. Splice in the original plug that wo. To diagnose trailer light problems, a simple test light will help find most problems that surface.

Had running light on that side. Upon testing it, the green wire connection failed the test. Refer to manufacturer installation instructions and specs. If all the lights appear dim or you have no lights at all, check the harness at the tow vehicle.

Austin Truck Repair, Austin, Texas, truck repair in Austin, trailer repair in Austin, hour emergency road service in Austin, reefer repair in Austin, dies. How to Test Continuity on Wires and Electrical Parts - Duration: 2:53. Sears PartsDirect 158views. You've connected the trailer to the vehicle, but the turn signals and brake lights don't work. You don't know if the wiring is bad or you have bad bulbs.

Trailer Connector Wiring Schematics.