Troubleshooting GMC Truck that Left Turn Signal on 7-Way Stopped Functioning  

I recommend testing the ground connections on the vehicle and the trailer. When you find that some of the lighting functions work, but not all of them, it is always best to check the ground connections. Check the ground on the connector on your…

It is possible that there is a blown fuse or relay related to the tow package wiring that is causing the problem. Use the vehicle owner's manual to find the locations. It is also possible that there is a break in the wire somewhere. You will need…

It could just be a tow package fuse blown on your truck. There is one for trailer left turn signal and brake light in the fuse box in the cab between the dash and driver's side door. It is labeled LT TRLR ST/TRN. You would not be able to tap into…

Without knowing the year, make and model of the vehicle, I can't really provide any specifics but I can provide you some general things to check. The first thing you'll want to do is determine if the problem is in the vehicle or the trailer…

First thing you should do at this point is test the 4-way of the wiring harness with a circuit tester part #PTW2993 for voltage on all of the right pins when the taillight signals are being applied. Just like in the video I attached. If the voltage…

There would not be any additional fuses for the brake lights and turn signals for the trailer wiring on your 2006 GMC Sierra. There may be relays related to the tow package that could be bad if the fuses were blown. I would check your owners manual…

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

The OEM prep package consists of 4 "pucks" in the bed of the truck that will allow you to drop in puck style hitches for easy installation and removal, that gives you a completely clear bed when not in use. The B&W Companion OEM 5th…

There is only one difference between the Curt Trailer Hitch Receiver #C13176 and etrailer Trailer Hitch Receiver #e98909 that fit your 2020 Chevrolet Colorado, which is the finish. The Curt trailer hitch has a glossy black finish while the etrailer…

The best brake controller option to go with is one that activates the brakes proportionally instead of time delayed. A proportional brake controller will activate the trailer brakes at the same time and with the same intensity as the tow vehicle…

It could be a tow package fuse on the vehicle. Use the owners manual to find the locations of fuses/relays related to the tow package wiring to check them and replace as needed. If the issue is not a fuse or relay then you can test the vehicle side…