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Your issue sounds like lack of amperage and not a voltage issue, you can have voltage without amperage. Your car battery could have 12 volts but if the amperage isn't there you will not be able to crank the engine . A wire worn down to 1 or 2 strands, a wire broken inside of the insulation. I've seen wires start to corrode on the inside of the insulation and just rot. I've also had issues with ground wires in particular. My meter tests good, my test light shows the engine has good ground yet the starter can't get a good enough ground to complete the circuit due to a frayed ground strap.
I would start with swapping the wires from the opposite side on the controller as someone else mentioned. if it still doesn't work go after wires. If it does work it's something with the controller, or maybe a voltage/ground issue to the controller. If you have a voltage or ground issue going into the controller you will have issues coming out of the controller also.
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