What was found
(CAN) ALTERNATOR NO CHARGE LIGHT CAME ON ABOUT HALF WAY DURING 1.7 HOUR FLIGHT FROM TG3 TO CYXK, JUST AFTER VACUUM PUMP FAILURE. PILOT SHUT DOWN ELECTRICAL SYSTEMS TO SAVE BATTERY POWER AND WAS ABLE TO PERFORM NECESSARY COMMUNICATIONS WITH FSS ,AND TERMINATED FLIGHT AS INTENDED. PRELIMINARY INSPECTION DID NOT SHOW TROUBLE AS WIRES TIED IN BUNDLE AT VICINITY OF ALTERNATOR. BEGAN TO REMOVE ALTERNATOR. MAIN CABLE TERMINAL LUG FELL OFF THE END OF CABLE. REPLACED LUG. GROUND RUN OK. (X)