trailer light troubles 2020 LTZ 1500

[Burbo]

I have a 2020 LTZ. The running lights for the trailer do not work. I get power for the turn signals. I checked the fuses, all are ok. Any  idea where to start? Just went out of warranty, so this is on my dime.

[gemarsh]

5 hours ago, Burbo said:

I have a 2020 LTZ. The running lights for the trailer do not work. I get power for the turn signals. I checked the fuses, all are ok. Any  idea where to start? Just went out of warranty, so this is on my dime.

You can buy a cheap tester that plugs into the trucks 7-Way. It will light up a led light for each circuit. 

 

Do you have another truck to check your trailer? Or another known good trailer to test your truck?

 

https://www.amazon.com/MaxxHaul-50155-Trailer-Wiring-Tester/dp/B07QX2L7K5/ref=mp_s_a_1_5?crid=33U952MEHO4P0&keywords=7+way+trailer+plug+tester&qid=1677444718&sprefix=7-way+test%2Caps%2C173&sr=8-5

Edited February 26, 2023 by gemarsh

[ronnie vasconcellos]

 I have a similar issue. Mine says the trailer disconnected, ck connection.   there's no power to taillights, the fuse for trailer park lights #41 is good and has power to both sides but there is no tail light power at the trailer plug, or the connector  that plugs into it.  I curious to what's happening.

[Bikerjon]

The wiring tester is the best place to start. Dont assume your trailer wiring is OK. If your truck has power on the running light circuit on the 7-way connector on the truck start trouble shooting the trailer. I would use a 12 volt battery to power and ground  the running light circuit on the trailer while looking for open circuits or broken wires on the trailer. If the trailer is old/ancient you may want to rewire the trailer. Most trailers are built with shitty wiring.