Wiring for the servo is simple. There's two main power wires (12V) and then three wires to the potentiometer.

The potentiometer has a 5V+ve and a sense ground. The third wire is the wiper.

If the 12V wires are hooked up to the correct wires (either way round) and the potentiometer wires are correct then you will know if the 12V lines are the correct way around as the servo will either operate correctly or operate in reverse. To solve this either swap the wires around (best option) or fudge it in software (lazy option but works).

I don't have the MC16 wire diagram to hand so can't tell you the colours, but the MC16 through to 28 all operate the same way.

Cheers,

Matt