THE PILOT COULD NOT START THE AIRPLANE. ACCORDING TO LINE MAINTENANCE PERSON, THE PILOT WAS ASKED IF HE WANTED A 12 VOLT OR A 24 VOLT JUMP START. THE PILOT REPLIED THAT HE WANTED A 24 VOLT JUMP START. AFTER THE AIRPLANE STARTED THE FLIGHT DEPARTED WITHOUT FURTHER INCIDENT. WHILE CURISING AT 6000 FEET, THE PILOT REPORTED A LOSS OF ENGINE POWER. THE PILOT INFORMED DEPARTURE CONTROL OF HIS PROBLEM AND REQUESTED VECTORS TO THE NEAREST AIRPORT. THE PILOT WAS ISSUED VECTORS TO THE WRENS MEMORIAL AIRPORT; THE AIRPLANE CRASHED IN AN INVERTED ATTITUDE 1/4 MILE SHORT OF RUNWAY.