Perhaps just start with an electric cup. Just the things that absolutely can't freeze. Should not draw more than an amp. If it does then that is decidedly cause for concern.
Okay, so how would I hook up a 12volt plug to plug up a cell phone charger???
I don't get why the Raider's charging system is as finicky as it is. Take too much load off and the stator whines; put too much load on, and it whines again, even though the load is far below its unused output. When I run heated gloves as well as Gerbing's jacket/pants/socks liners, I hear the stator whine whenever I turn them up more than 50% even though they draw about 60 watts at that point.