ACR LTT ACFT STRUCK A SVC TRUCK DURING TAXI TO GATE PARKING.

Narrative

TAXIING INTO GATE AREA I NOTICED A PARKED TRUCK OFF OUR L SIDE THAT LOOKED LIKE IT WOULD BE VERY CLOSE TO OUR WINGTIP. I STOPPED THE ACFT BUT THE GND GUIDE KEPT SIGNALING US TO MOVE FORWARD. AT THIS POINT I ORDERED THE FO TO WATCH THE GND GUIDE AND I WATCHED THE WINGTIP. THE TRUCK LOOKED TO ME TO BE NO MORE THAN 2 INCHES FROM OUR WINGTIP. I ASKED THE FO IF THE GND GUIDE WAS STILL SIGNALING US TO PROCEED AND HE REPLIED IN THE AFFIRMATIVE. I MOVED FORWARD VERY SLOWLY UNTIL THE NAV LIGHT COVER CONTACTED THE TRUCK AND THEN STOPPED. FROM MY ANGLE UP TO THE POINT OF CONTACT; IT LOOKED AS THOUGH WE WOULD CLR THE TRUCK BUT NOT BY MUCH. I MISJUDGED THE DISTANCE. AFTER SHUTTING DOWN; INSPECTION OF THE WINGTIP REVEALED THE COVER OVER THE NAV LIGHTS TO BE BROKEN. THIS PART COST $649.00 WITHOUT LABOR. IN RETROSPECT; I SHOULD HAVE NOT MOVED THE ACFT UNTIL THE TRUCK WAS MOVED OR A WING WALKER WAS SUPPLIED. THE GND GUIDE WAS APPARENTLY OBLIVIOUS TO THE TRUCK AS KEPT MOTIONING US FORWARD EVEN AFTER WE HIT IT.