How to Check Function on Vehicle Side Trailer Connector  

Question:

Expert Reply:

The best way to determine whether or not the connector is functioning as it should would be to use a circuit tester, part # 3808 if needed, and test the prongs in the plug for power.

You can see some diagrams for the different plug configurations at the link I provided. This will help you to see which prongs should be performing which functions, and allow you to test them accordingly. For example, if a prong is used for the turn signal function, you would have a friend engage the turn signal in the cab of the vehicle while you test the prong for power.

If you find that the plug is not getting power correctly, or if it is only getting power on certain prongs, you will need to move the search backward, into the vehicle harness to determine where the problem is actually starting.

If the plug face on your vehicle is able to be separated from the vehicle harness, like the # PK11893-11933 wiring connector, then you can remove the plug and use your circuit tester to test the connections on the vehicle receptacle. If you are looking at the product image for part # PK11893-11933 this would be the blue side of the connector.

If you get power correctly on the vehicle connector, but not on the plug itself, this would tell you that the issue is inside the plug. If you are not getting power correctly on the vehicle connector, then the issue would most likely be contained within the vehicle wiring system further down the line.

I would be glad to look into this a little further for you if you could provide the year, make, and model of your vehicle.

expert reply by: Sarah L

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