ELECTRICAL SYSTEM - continued - TM-9-2320-391-100096

TM 9-2320-391-10

M1078A1 SERIES THEORY OF OPERATION -

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Continued

ELECTRICAL SYSTEM - Continued

Main Light Switch (Vehicle S/N 11,438 to 18,549). The main light switch is the only

switch that is active even when the master power switch is off.

1. Positioning the main selector lever to SER DRIVE causes the headlights, taillights,

marker lights, and clearance lights to illuminate; stoplights will illuminate when the

ignition switch is turned on and brake pedal is depressed.

2. Positioning the main selector lever to STOPLIGHT extinguishes all vehicle lights but

allows stoplights to illuminate when brake pedal is depressed.

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