How to Test a 7-Way Trailer Connector on a Tow Vehicle  

Since you are not getting the 12V power when your truck is running, you most likely don't have a fuse issue as you stated their isn't a specified fuse or relay in the owners manual. The issue is that your truck is computerized even at the…

The reason your trailer's lights are flashing is usually attributed to too little resistance given off of the tow vehicle to measure weather the light or not. An easy way to fix this is to use a 7-way with integrated load resistors like the 7-Way…

The trailer wiring on the newer trucks like what you are experiencing on your 2019 GMC Sierra 1500 and the new Ford trucks with the "smart tow" package are proving to be challenging for reasons like what you found where the truck…

Since the lights work intermittently I do not think that your 2008 Lexus GX 470 suffers from the same issues that would require adapter #C57003. I think what we are seeing here is a ground problem or general wiring issue. Ground problems normally…

Thank you for all of the details. So far you have done an excellent job at troubleshooting by using the Curt #C57003 and connecting your truck and trailer to another truck and another trailer. Since this problem didn't start to occur until after…

The issue you are having definitely could be that the LED trailer lights aren't pulling enough power for your 2019 Chevy Silverado to read the lights are connected, causing the message you are seeing. That's more than likely what is…

Yes. The 7 Way Trailer Connector Vehicle Tester #C73NR will work to test the 7 way connector on your 2019 Chevy 2500 Diesel High Country. This tester will allow you to check the functioning on the pins of your 7 way.

Adapters like the Curt part #C57003 are designed for use on vehicles that will show a "bulb out" error code if towing a trailer with LED taillights like what your 2014 Land Rover LR4 would have. This would would well for you if your trailer…

You are correct that GM changed the wiring to the 7-way connector on the 2019 and newer Chevrolet Silverados and 2019 and newer GMC Sierras. We have run into some customers that have had issues with getting the trailer lights to work properly, but…

Since you have a Chevy factory integrated controller you can use a circuit tester like #PTW2993 to test the brake circuit pin on your 7-way. The linked photo shows the functions on each pin on a standard 7-way installation and the arrows indicate…

Yes, the Curt 7-Way Trailer Adapter for Towing Trailers with LED Lights item #C57003 will solve your flickering problem. This adapter plugs into your existing 7-way when towing a trailer equipped with LED lights so that your vehicle's computer…

There's a connection you still need to make under the hood of your 2016 Chevy Silverado 2500 to complete the 12 volt power circuit of the 7-way at the rear of your truck. If you check out the picture I attached you'll see what connection I am…