I am new here to this forum. I have a problem with my Scan Gauge II in my motor home. My RV is a 2004 E450 Chassis, with a V-10 Engine. My Scan Gauge II was working perfectly. We stopped and had lunch. I started the RV not only was it no longer working but also the GPS and the XM Radio receiver were no longer working. I unplugged the GPS and XM Receiver from the cigarette lighter. Plugged both into the 12v Auxiliary plug they both work now; but the Scan Gauge II does not work is the OBD tied into the cigarette lighter plug? Thanks for any thing you folks can bring up. Also I heard that there was a software upgrade for my scan Gauge II is that true?