My trucks at Performance Diesel & Gas in Grand Rapids, Michiagian and they are having problems installing a Isspro shut down timer on my o6 cummins, they said they got power and have it installed to the ignition but it doesn't keep the truck running. I need it for work and get nervous when somthing goes wrong with my pride and joy. CAN SOMEBODY HELP,HAS ANY BODY ELSE WIRED THIS UP BEFORE?