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Join Date: Apr 2008
Location: Western New York, The FingerLakes Region, small town, Bloomfield, NY
Posts: 268
Bikes: 2008 Currie eZip Trailz, 1971 Raleigh Super Course, bought new for Honeymoon camping trip around Nova Scotia
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Mike
The three wires going to the switch are two plus (+) leads one from each battery pack assembly (left and right, one orange, one red) on the carrier. The switch selects between 24 volts from left assembly or 24V from the right and puts that to the red to the controller. All of the black (-) leads are hooked together just before the harness to the controller.
Since each battery pack assembly is 24 volts, you would need 2 12volt batteries hooked in series to get 24 to make the equivalent of a third battery pack assembly. You would then need to add a second single pole, double throw switch to select between your B battery and your new C battery (with the present switch set to B).
I have 2 battery pack assemblies. They weigh 16 lbs each. I'm not sure I would want to add 16 more pounds. I look for places to recharge.