I have a Tige ski boat with Mercruiser fuel injected black scorpion engine with direct drive. When I turn the key I get a click sound near the starter but the starter does not engage. I have 13 volts to the starter. When I cross the two terminals on the starter with a wrench it engages and starts right up so it appears the starter does work fine. It just does not get the juice or signal to engage. What should I be looking at fixing or replacing?