I've a JS200LC and it has diesel transfer pump for filling from a bowser. The switch was broke since I got it so hadn't used it, but now I've had the thought: Is it a 12V or a 24V pump? On the pump the writing is all worn off, can'r get the model or anything. The leads going to the battery(s) are crocodile clips and obviously not connected when not used so I don't know what to set this pump up for. What do you guys think, try it at 12V and see if it pumps OK then try it at 24V and see how it goes? I'd rather not burn anything out while I'm at it.