I have a 71 50hp electric shift motor. The problem I am experiencing is that the motor won't start with the key switch. I tried jumping the starter motor and it still won't fully turn over. The starter solnoid is good, I have power going from the command centre to the engine...and power from the engine down to the shifting soilnoid in the foot. Could this be the promblem point?? Could the shifting solnoid be fried?? Anyway to test this?