Fanum said:still can't see the need for a rheostat TBH....if it's cold enough to put on, you'll keep it plugged in.....if it's not, you won't.....
Mounting a control, connecting both sides to it etc etc just adds layers of complication...K.I.S.S.
Once I've got some adequately rated curly cable though, I'm going to take the plug apart, fill it with silicone and seal it all up again....
PS I've got a line on some 12v flexible rubber heating pads if anyone's interested.....they use them to heat the tanks of the latest generation of commercial dishwashers and look like they might be perfik for sticking under the seat coverings
I can see the advantage of the reostat, if its really cold, youll just leav it on, but would like to be able to turn down, when filtering or stopped, putting the reostat between the socket and the battery, will mean your not either cold or overcooked, maybe not as automated as using a thermostat, but should be easier to use.