(1) Position main light switch to SER DRIVE
(2) If no cab top marker lights illuminate,
go to step 5 of this fault.
(3) Position main light switch to OFF
(1) Remove two screws and lens cover from
marker light base.
(2) Remove marker light lamp from socket.
(3) Set multimeter to ohms.
(4) Check continuity through marker light
lamp and note reading on multimeter.
(5) If continuity is not present, replace marker
light lamp (para 7-31).
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