[rrritchey]

Hi Mike,
I am glad you realized you had the other 2 channels available. I would use both the power leads and leave one of the single leads off. This way if anything were to ever happen to a power and ground on one lead (corroded pin, etc) then you would have the other power lead. Its advisable to periodically check power on both leads by unplugging one then the other. You don't have to do this very often but since there is no real indication one lead could be bad you should make sure both are good. Any time you have redundant leads on anything you should periodically check each one.