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Dear 4020, First, it depends whether or not that pump is polarity sensitive i.e. will it run okay regardless of how its wired. You might take a look at the pump and any literature with it to see if its polarity matters (will it work on pos or neg ground tractors). Grounded to frame DC starter motors run the same direction regardless of battery polarity, which is why you can reverse the batterys but they still turn the same direction, but I have no idea of your particular units operation. If it is polarity sensitive, then you would have to use an assortment of relays and/or switches to switch batterys (both + and -), and it could be an electricians nightmare depending upon the pumps power rating and what kind of relays or switches etc. you have to purchase. Also if its frame case grounded, it may have to be electrically isolated depending upon where and how its mounted. If its not polarity sensitive, yes you can more easily choose which battery to run it from. It would have to be frame case grounded to the tractors frame or a wire to it with its input power switched via a single pole double throw switch rated at or above the motors load current. Then the switches wiper (pole) is wired to the motors input, while the switches 2 throws are wired to the individual batterys non grounded posts. See if its polarity sensitive and what current it draws and post back any more questions. John T Nordhoff in Indiana
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