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My first thoughts are you should repair overhaul the original alternator. Take it to an auto electrician for that job. The" ËXC" is for exciter which goes to the ignition switch, power when the switch is turned ON. The "S" is the sense wire so that the inbuilt voltage regulator can sense the battery voltage and allow the alternator to charge the correct rate. So in fact your two purple wires connected into one larger purple wire which has to be HOT which you say it is not hot, so make it hot and your alternator should work. There may be a warning light in that EXC wire so check to see if the bulb in it is OK. Follow the wiring along and find out why the connection at the terminal block is not getting hot. Look behind the dash panel at the ignition switch terminals or find a fuse box which might have faulty or corroded fuse connections. It is a boat and subject to damp conditions. Good luck, regards, Kevin.