How to Test a 7 Pin Trailer Connector with a Multimeter and Troubleshooting my Trailer Wiring

My hands are in the way so I displayed a diagram in the upper right of the video that shows the the location of each pin to test the trailer connector. To test, refer to the diagram and the following instructions: 1) Turn on vehicle ignition. 2) Go to trailer connector with your multimeter and set it to measure DC volts. You may want to test it on a random battery to make sure it's in the correct mode and working properly. 3) To test the trailer connector, put the black probe on "-12VDC Ground", according to the diagram 4) Put the red probe on the circuit that you are testing. For example, to test the trailer running lights, put the red probe on "Running Lights", according to the diagram. For things like brakes lights, you may need someone in the car to apply the brakes while you measure voltage. 5) You should get voltage between 11-14 DC volts (depends on condition of battery and whether is is being charged/drained)

Your description in the comments is what I needed, and the video helps too. Thank you!!!

This is the best trouble shoot from brake controller to the trailer light connection I've seen. Thanks much.

Thanks, Buy yourself some Test Leads with Alligator clamps on the ends and save yourself a lot of trouble. I do appreciate the video showing the "jumping all over the place" LCD meter display for turn signal operation.

Thanks this was extremely useful and I was able to ensure my 7 pin connector is good! I knew there had to be a way with a simple multimeter, great video 🤘

Thanks for the video,,I need to check the brake voltage output. You made it simple.

Great video, I appreciate the walkthrough. 👌

This is very helpful . . . thanks for your time and effort !

Thanks for posting! Just what I needed.

Thanks for the share. My brand new truck's connector isn't connected On a truck, lol. This saved me some trying to validate this with other means.

Thank you for the video. This really helped me alot. The only concern / deviation is the fact that I get no volts registering whatsoever with the black probe on neg./neutral, and the red probe on hot. All else is just as you show. Anyway, lights on trailer work great, no issue. 2004 Suburban, BTW.

Very informative video. I was not expecting to learn all of that. Make more videos man.

Excellent video! Thank you so much. I needed to know how to test from the socket because the Toyota engineers never tried used the tool they provide (which is located in the engine fuse box) to take out a fuse. Impossible! Mine is a 4runner.

You’re not kidding - you’re the only video I’ve found on this

Thank you! Excellent video.

Good video, saved me time and money since I had a multi meter, of course still not sure why my lights aren’t working but my brakes are 😑

Awesome job

This helped a ton with an issue I’m having! Thanks!

Great Video, thanks! I was hoping you would do the MM Test on the Reverse Lights, I have a boat trailer that should have a "reverse override" so the Brakes don't get applied when backing up, up hill. Also, it would have been good to see the individual connections from the new Plug to the Trailer, as I don't think it was a simple color to color match as the initial diagram showed.

Great vid! I was going to make one myself!!