How To Test Trailer Wiring With A Multimeter

Next insert your black lead into the com port and your red into the voltage port. Using a multi meter to troubleshoot and check the voltages and grounds on a trailer light connector.

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How to test trailer wiring with a multimeter. See part 2 checking lighting system with an ohm meter. If you are wanting to use a multimeter to test the 12 volt system on your vehicle when you are installing the curt t connector wiring harness part c56165 you would set the multimeter like part btmt15 to 20 on the dc side. Then touch the black wire on the multimeter with the same colored contact under the light at the back of the trailer. Wire the vehicle side wiring harness to a standalone battery. Disconnect the trailer from the vehicle and run a test to determine if the trailer lights function properly. A quick and easy way to test the lights on any trailer with a flat 4 connector.

If the trailer lights function with such a setup it is clear the issue is. It is still a simple process but in this case you would have to power your trailer light them with a vehicle battery. To test if any of the wirings in the 7 pin plug is not working you will need to use your digital multimeter and ensure it is capable of testing for volts. I have attached a photo of the btmt15 and have noted where the test position is. Turn your multimeter to the v symbol on a multimeter dial. To test the other wires detach the multimeter from the green contact in the trailer plug and reattach it to whatever contact you want to test.

This method allows testing without a tow vehicle present and allows the tow vehicle to be eliminated as a possible. For a trailer light test without a vehicle you would need some wires to attach your plugs to the battery. How to test 7 pin plug with a multimeter. This will take the reading for a system that has 0 to 20 volts. What youre going to need to do this is a circuit tester and a buddy in the drivers seat to operate the. Today im going to show you how to test the functionality of a trailer four way connectors.

So disconnect the trailer plugs and use the wires on the pin to help you identify the specific pinholes you want to test. All you have to do is link up the white wire to the negative and the colored wires to the positive.

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