I have a 2006 Dodge Sprinter, customer says it dies overnight. after jump starting the truck, tested charging system and found truck is charging at 14v. Shut the truck off with all doors closed and watched instrument cluster. Cluster would time out after 45 sec but after 2 seconds the backlight and odometer would come back on, and would repeat this process over and over again. Also the HVAC unit still had power to it. The A/C and ESPAR light would remain on, also blower motor would still run at a reduced power. Would this be signs of a faulty IC or ignition switch, or could a door switch still be a possibility even though the cluster times out.