ATX SMT HIT A GND VEHICLE WHILE TAXIING TO MAINTENANCE AREA FOR A GENERATOR CHANGE.

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WHILE TAXIING AT DET; EBND ON TXWY JULIET; GND ADVISED ME OF VEHICLES ON TXWY AND TO USE CAUTION. I WAS GETTING PROGRESSIVE TAXI CLRNC TO BAY IN ORDER TO HAVE THE LEFT STARTER ON MY ACFT REPLACED. I WAS CLRED TO TAXI EBND ON JULIET AND NOTICED 2 VEHICLES ON THE TXWY. ONE VEH MOVED WHILE THE OTHER; A MINIVAN; REMAINED ON THE TXWY. THE VEH WAS PARKED ON THE S EDGE OF THE TXWY. IT ALSO WAS UNATTENDED AND RUNNING. ALSO; ON N EDGE OF THE TXWY; THERE WAS A SMALL SNOWBANK PREVENTING FULL ACCESS OF THE TXWY. I ANGLED TOWARD THE SNOWBANK AND GOT AS CLOSE AS I COULD IN ORDER TO CLR THE MINIVAN. I WAS STILL ANGLING AWAY FROM THE MINIVAN WHEN THE RIGHT MAIN TOP TANK CAME IN CONTACT WITH THE TOP LEFT REAR OF THE MINIVAN. I WAS UNAWARE OF THE COLLISION UNTIL ARPT PERSONNEL IN THE OTHER VEH ADVISED GND OF THE ACCIDENT. ALSO; THE TXWY HAD A DIP IN IT JUST N OF THE VAN. I HIT THIS DIP APPROX THE SAME TIME THAT THE COLLISION OCCURRED. BEFORE TRYING TO CLR THE VAN I STOPPED THE ACFT AND LOOKED AND IT LOOKED AS IF I HAD ENOUGH ROOM TO CLR THE VAN. THAT IS WHEN I ANGLED TOWARD THE N EDGE OF TXWY AT A VERY SLOW TAXI SPD. THERE WAS A VERY LIGHT COAT OF SNOW ON TXWY; AND THE SUN WAS OUT PRODUCING A GOOD GLARE OFF THE SNOW ON THE SURFACE OF THE ARPT. LESSON LEARNED; NEXT TIME I'LL MANEUVER ACFT IN ORDER TO CLR OBSTRUCTIONS AND THEN SHUTDOWN AND GO TAKE A LOOK; OR GET ASSISTANCE FROM GND PERSONNEL. IF VEHICLES ARE EVER BLOCKING MY WAY IN THE FUTURE; I'LL ASK FOR CLRNC ONTO ANOTHER TXWY OR WAIT UNTIL THE VEHICLES ARE MOVED.