I installed an aftermarket radio in my 2006 Silverado 2500HD and after a while all the gauges quit and the a/c wouldn’t blow. When I shut the truck off and try to start it would run for a few seconds and shut off. I tried to bypass the axxess system by unplugging the harness going to coming off the amp behind the radio and plugging the new radio in there. Any information will be greatly appreciated.