Figure 1-5. Hydraulic System.

TM 10-3930-627-12

h. Electrical Units.

resistance winding to change the current in the gage

(1) Spotlight. The sealed-beam spotlight is

circuit proportional to the fuel level, which is registered

on the instrument.

mounted on the left hand hoist upright. This light is

(5) Oil pressure sending unit. The oil

operated by a toggle switch mounted on the instrument

pressure sending unit is connected into the pressure side

panel. The switch mounted on the spotlight itself is

of the lubricating oil system. This unit contains a coil,

bypassed, and will not operate the light.

(2) Combination tail and stop light. The tail

the resistance of which varies with pressure. Actuating

current to the instrument passes through this resistance

and stop light is mounted within a steel guard on the

coil which varies the current, and thus the indication, in

upper rear of the engine compartment. The taillight

proportion to the pressure on the sending unit.

operates when the spotlight is turned on. The stop light

(6) Coolant temperature sending unit. The

is operated by the brake light switch when the foot

coolant temperature sending unit is threaded into the

brakes are used.

(3) Ignition switch. The ignition switch is

engine cylinder head (fig. 1-2) to sense and respond to

engine coolant temperature.

This unit contains a

mounted on the instrument panel. Setting the ignition

temperature sensitive resistance coil

switch to ON position energizes the ignition system and

instrument panel gages.

(4) Fuel gage sending unit. The fuel gage

sending unit is mounted atop the fuel tank. This unit

consists of a float mounted on an arm attached to a

sliding contact. The position of the arm is proportional to

the quantity of fuel. The slider shorts out turns of a

1-7