MIL FLC OF HU25 FALCON JET HAS CONSTANT SPD DRIVE FAILURE WHICH LEADS TO OVERHEAT OF THE MAIN AC GENERATOR. DIVERT TO IAD AS THE BEST ARPT IN IMC. AFTER LNDG FULL STOP ON RWY LEADS TO GAR FOR ACFT FOLLOWING.

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WHILE FLYING FROM MEM TO FMH AT FL410; THE ACFT'S CONSTANT SPD DRIVE MOTOR; WHICH RUNS THE MAIN AC GENERATOR; OVERHEATED. THE EMER PROC DICTATES TURNING OFF THE CONSTANT SPD DRIVE (ESSENTIALLY SECURING THE MAIN AC GENERATOR); SWITCHING THE AC LOAD TO THE APU AND THEN LNDG ASAP. AT THIS POINT; WE WERE 30 NM W OF AML AND REQUESTED A DIVERT INTO DULLES INTL ARPT. WX CONDITIONS ALONG THE NE WERE LOW IMC DUE TO SNOW AND FOG. TEB WAS CLOSED DUE TO SNOW ON THE RWY AND OTHER NEW YORK AREA ARPTS WERE EXPERIENCING DELAYS DUE TO WX. DULLES WAS THE PRIMARY DIVERT FOR THOSE AREAS. WASHINGTON APCH WAS VERY ACCOMMODATING; VECTORED US INTO THE FLOW OF TFC FOR AN ILS TO RWY 19R. THE PLT IN THE R SEAT FLEW THE APCH AND LNDG AND DECELERATED THE ACFT ON THE DECK. I WAS IN THE L SEAT AND ONCE WE REACHED A SAFE SPD; TOOK CTLS; BROUGHT THE ACFT TO A FULL STOP ON THE RWY JUST PAST A TXWY. WE REQUESTED A 180 DEG TURN TO EXIT THE RWY QUICKLY. NEEDLESS TO SAY; WE WERE NOT QUICK SINCE WE DID NOT USE THE HIGH SPD TXWY AND THE ACFT BEHIND US ON THE APCH HAD TO EXECUTE A GAR. AFTER WE PARKED THE ACFT; WE RECEIVED THE INFAMOUS CALL FROM TWR; WHO VERY CALMLY (THANKFULLY) EXPRESSED HIS CONCERNS. CONTRIBUTING FACTORS: 1) EXPERIENCING AN ELECTRICAL PROB IN THE GOO AND LNDG AT AN UNFAMILIAR AND BUSY ARPT WITH A 'LAND ASAP' EMER PRESENTED A CHALLENGING SIT FOR US. 2) WE WERE TIRED; HAVING FLOWN 4.8 HRS FOR THE DAY; ON THE LAST DAY OF A 3- DAY TRIP. 3) AS MIL PLTS; WE HAVE VERY LITTLE EXPERIENCE OPERATING AT BUSY ARPTS; ESPECIALLY WHERE TIME MEANS MONEY. IT IS A DIFFERENT ENVIRONMENT FOR US TO OPERATE IN. 4) IT APPEARED ALL PLAYERS WERE HAVING A TOUGH TIME DUE TO THE WX AND HVY TFC FLOW. THIS INCLUDED APCH CTL; TWR AND OURSELVES. BASICALLY; THE ENTIRE CREW WAS FOCUSED ON SAFELY LNDG THE ACFT. SINCE WE WERE TIRED; WE WERE CONCENTRATING ON PUTTING THE ACFT ON THE DECK AND NOT PAST THAT POINT. NEITHER PLT VERBALIZED THE USE OF HIGH SPD TXWYS AND WE DID WHAT WE ALWAYS DO AT HOME AT THE END OF A LONG SORTIE -- FULL STOP ON THE RWY; COMPLETE A 180 DEG TURN AND EXIT AT THE MID-FIELD TXWY. LESSON LEARNED: USE THE HIGH SPD TXWYS IF THEY ARE AVAILABLE.