1. Remove rear main harness circuit 21 plug (1) fromfront main harness circuit 21 jack (2) oninstrument panel.2. Measure voltage between front main harnessjack (2) and ground.3. Does multimeter read less than 17 volts?1. Turn MASTER SWITCH to OFF.2. Remove instrument panel for access. See task:remove instrument panel mounts and ground lead(page 11-2)..3. Remove front main harness plug (1) from lightingcontrol switch jack (2)..4. Measure resistance between lighting control switchjack (2) pin H (3) and circuit 21 jack (4).1. Does multimeter read O ohms?1. Repair rear main harnesscircuit 21 (page 14-3).2. Verify no faults found.1. Install rear main harness circuit 21 plug on lefttail light jack.2. Replace main light switch (page 11-9).3. Verify no faults found.1. Install rear main harnesscircuit 21 plug on left taillight jack.2. Repair front main harnesscircuit 21 (page 14-3).3. Verify no faults found.3-99TM 9-2350-261-20-1
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