Figure 2.
2-1/2-ton, 6x6, shop van truck M109 - left front view.
a. The shop van body is provided with necessary electrical components to
permit the use of 24-volt DC power or 1t5-volt AC power to operate the dome lights
and exhaust blower. Power is brought in from the entrance receptacle (fig 4) which
is located behind the folding ladder on the right front end of the van body.
(1) Located on the right side of the front panel on the inside of the
van are the power controls (fig 5). The power switch selects either the 24-volt DC
battery system or the 115-volt AC system. With the switch in the UP position it
selects 115-volt AC; in the DOWN position it selects the 24-volt DC.
(2) The circuit breaker (CB) No 1, upper left-hand, controls 115 volts
AC to the molding receptacle above the right panel windows; CB No 2, upper right-
hand, controls AC to the molding receptacle on the left side; CB No 3, lower left-
hand, controls AC to the converter; and CB No 4, lower right-hand, controls AC to
the dome light switch. The breakers provide overload protection. When a circuit
is overloaded the breaker trips to the OFF position. After removal of the overload
cause the CB must be manually reset to the ON position.
(3) The dome light switch is a three-position switch. The center
position is OFF; lower ON position supplies 115 volts AC to the dome lights; and
upper ON position supplies 115 volts AC to the normal dome lights and blackout
lights. The normal lights are in series with the 115-volt rear door blackout
switch, so when the door is open only the blackout lights remain on.
(4) Located in the rear on the inside above the door are two toggle
switches. These switches control the 24-volt dome lights. When the blackout
switch is ON, as the door opens the normal lights go out leaving only the black
lamps glowing. When the blackout switch is OFF, the other switch controls the
interior lighting (fig 6A).
OS 010, 9-P3
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