I just bought a 1991 115 and put it on an old 17 mako I bought that had no power. I purchased the motor without controls and tried using a 703 control box from a 1987 50 hp. The plug was the same but when I turn the key to the on position the 20 amp fuse blows. with the key in the off position the trim/tilt button on the motor works and does not blow the fuse. Is this being caused because its not the right control or do I have another problem. please help.