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Series/parallel is a decent option for speed control, but typically at lower voltages. The transition between 0-72-144 would be enough to break things. The Citi/Comutacars had 3 speeds using a contactor controller: 24v(across a resistor) - straight 24v - 48v.
Ben: the ForkenSwift is using the potbox from the forklift. It's got high & low microswitches (we're only using the low), return spring, etc. I had to change the potentiometer itself though, since the one from the forklift had different resistance than what we needed (using a $2 one from Radio Shack).
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