Has anyone ever heard of having to install a resistor in the dimmer line if you have installed an aftermaket stereo? My "sys" error is flashing since the new radio was installed and the check gauges flashes on and off in a random sequence. I have installed a new ccm but the problems still exist. The gas gauge reads full most of time as well. Any thoughts here would be greatly appreciated. I was told that this is probably the cause of the problems but can't find what resistor should be installed.