CONTINUITY TEST Change 1          2-575 TM 9-2320-365-20-1   (1)  Remove two screws and lens cover from         RH cab top marker light base.   (2)  Remove RH cab top marker lamp from         socket.   (3)  Remove four screws from RH cab top         marker light base. NOTE Do not let wires slip through hole into cab structure.  If wires slip into cab structure, vehicle will need further disassembly to retrieve wires.   (4)  Remove nut, lockwasher, terminal lug         TL3, and lockwasher from RH cab top         marker light base. Discard lockwashers.   (5)  Extend base and disconnect marker light         connector from connector P55.   (6)  Remove gasket from RH cab top marker         light base.  Discard gasket.   (7)  Set multimeter to ohms.   (8)  Connect positive (+) probe of multimeter         to terminal lug TL3.   (9)  Connect negative (-) probe of multimeter         to ground and note reading on multimeter. (10)  If continuity is not present, repair wire         3097 from terminal lug TL86 to splice E24         (para 2-40) or replace cab clearance and         marker lights cable assembly (para 7-59). (11)  If continuity is present, repair wire 1951         from terminal lug TL74 to splice E23         (para 2-40) or replace cab clearance and         marker lights cable assembly (para 7-59). (12)  Install gasket on RH cab top marker         light base. (13)  Connect connector P55 to marker light         connector. (14)  Install lockwasher, terminal lug TL3,         lockwasher, and nut on back of RH cab         top marker light base. (15)  Install RH cab top marker light base on         vehicle with four screws. (16)  Install RH cab top marker light lamp in         socket. (17)  Install lens cover on RH cab top marker         light base with two screws.