Hi all, I am having a problem getting my laptop to charge in my work truck. I am using: -2011 Dodge Ram 3500 with a diesel engine. (Had the exact same problem with a 2010 Ford F-350 gas engine) -Wagan Smart AC 120W USB Inverter (has a 3 prong outlet for my laptop cord to plug into) -Samsung RV515 laptop The problem I am having is the laptop wont charge (doesn't matter if the laptop is on of off) while the truck is running. But if I turn the truck off and rotate the key to the "Accessory" position it works. My truck is equipped with a MTC (Medical Treatment Centre) which is basically a cap mounted in the bed that is used to transport and treat patients. I don't have any of the lights or heaters turned on in the MTC when I experience this problem. So why does my laptop only charge when my truck is off? Thanks all!!