It came with a used boat I bought this spring, it was still in the box.  Finally got a chance to hook it up and use it yesterday, as soon as I connect to the battery the prop starts spinning.  Doesn't matter if the tiller selector is "off" "forward" or "reverse"  It spins the same direction and at a constant slow speed regardless of the speed or direction selected.

Any ideas on what to check?  I called MinnKota and they said take it to a service center and pay to have it looked at since I didn't buy it myself.

Thanks