I have had some issues with a controller I purchased @ mp3car about two years ago, that I have only recently gotten a chance to install. They system will randomly shutdown and on several occasions not start at all. I saw the thread about the resistor mod; how can I determine if this is my issue? Also how does the Optional Power Switch Connection suppose to function? I thought It was suppose to initiate a immediate shutdown or startup? For me it doesn't seem to do anything???