ISK

I have a 2021 GMC Sierra AT4. I've got a ramp with castors on one end to load a sled into the bed. There are just two small LEDs on the back end of the ramp. One hot wire and one ground that are (supposed to) power both lights on when the headlights are on. No turn or brake lights, just running lights essentially. Well when I initially plug them in they both turn on, after driving for a couple minutes I get a trailer disconnected warning on the dash. So I go out and check it, the right side is still powered on but the left is out. Same process repeats itself if I turn the truck off and back on after a while. I ignored the light and left it plugged in for 20min one night only to have the alarm start blaring because the truck thought someone was disconnecting, and thus trying to steal the trailer. Ridiculous! Both lights light up fine and stay on when connected to a 2019 F-250. I've checked the 4-way adaptor which is fine. I've also bought the curt 4-way adaptor with the built in resistors, same problem. I've created a "trailer profile" which didn't make a difference. Don't tell me it's a fuse or the ground, because it's 1 hot and 1 ground wire powering both and the right side is staying on. WTF? I called my dealer since it's under warranty, they've never heard of the problem and said "all we can do is test the plug and fuses". If they're fine it's an issue with your sled ramp. You should have heard the crickets when I said well it works just fine with other vehicles...