Chevy man

[Bobbytheroofer1]

I have numerous trailers for different purposes but this truck ( 2019 Silverado LTZ) has an issue with a cargo trailer. when you turn on the lights after hooking up the trailer the truck shuts off the tail lights after a few seconds. I put on a new sealed connector cord still the same. All lights would come on for a few seconds and then go off. I hooked the trailer up to two other vehicles and it worked fine. I removed each light individually until the light (once reset) would stay on and replaced the light. I did this with several lights and each time i replaced a light next time it would be a different light that would cause it not to work. I have also hooked up this truck to other trailers and it works fine. It is like if you remove a light from the circuit it will work but once you replace this light it will be a different light. I took it to the dealer and they ran a test and said the truck is fine but it is shutting the tail lights off on its own. The brake and turn signals work fine. I am ready to give up!

[davester]

are the trailer lights all LED?  maybe the truck "thinks" there's no trailer because the lights aren't using enough power?  Or maybe it's grounding through the hitch instead of using the ground on the connector?