My PB-6 has two sets of wires coming out of it - a brown/blue pair and a black/white pair. You will want to use the black/white pair.
Black/white starts at zero ohms (short - full deflection on an analog meter) at 'throttle off' and goes to a bit higher than 5k ohms at full throttle.
Brown/blue pair starts off at about 5k, and goes to about 10k. Not used in my Alltrax application. - left disconnected.
Your pot box may have different wires - in any event, it sounds like you tested the correct ones. You can test it with the Alltrax and a computer to make sure you get full throttle range (0 to 100%)
Hope this helps!
Tom
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