hi all, yesterday i was using my boat @ 3000rpm when the battery neg cable came off, please do not ask why. I am now blowing the 30 amp main relay fuse when i turn the key to the `on?position. i think my ecu has died. I disconnected all the sensors on the motor and in the remote control and the fuse still blows. Is there any way to check the ecu before i buy a very expensive new one? Thanks for any input.