Thomas Karr

When I plug my 2019 GMC 1500 Sierra into my travel trailer it shows no signal to my rear facing furion camera on the trailer. I can put a jumper in my seven way plug on the trailer and make the camera show on my plug in monitor. As soon as I plug it into my truck with the lights on and truck running it shows no signal to my camera. My RV supplier told me mine was the third GMC/Chevy 2019/2020 trucks in the last two weeks with this problem. Glich is in the vehicles. What’s the problem. My trailer is presided for the furion camera.