2017 Sierra 1500 5,3L . For a while, especially when it's wet and humid, I had electrical issues while I was using breaks or flashers. For example, this morning, I had to open and close the driver window when I started the engine (message on the gauge); I drove for 2 minutes with a trailer connected to the 7-way plug. At the first road crossing, the engine stopped, wipers started for one lap, gauges and media turned OFF. I turned off the ignition switch and started the engine flawlessly. I was driving for about 20 minutes. The radio (media) blinked 4-5 times during this time. At my destination, I turned off the engine, went outside the truck, and realized I could not remotely lock the doors. I went back in, but no power at all. Few times I turned on and off the ignition switch without improvement. I unplugged the trailer and got back the power. It was the first time it's happened with a trailer, but a few times before, without a trailer, I got all these issues except the wiper. One time was during the night, and trust me, it's not safe at all to lose all lights (Including headlights), engine power, and power steering simultaneously. I checked the negative and positive cables at the battery. No corrosion, play, or cracks there. Does anyone have an idea where this kind of issue comes from altogether?
Thanks
