Generator Voltage Regulators

Maintenance of the M88A1
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78

cooling the generator. The electrically operated blower draws air from the

crew compartment, forces it through the generator, and exhausts it upward

through an outlet near the right camshaft gear housing.

Generator Voltage Regulators.

The M88A1 recovery vehicle has two

solid-state generator voltage regulators (figure 35, view A, on the

following page) (part number: 11672403), which maintain generator output

voltage at a constant 28 .7 volts dc.

One regulator controls the

generator voltage output of the main engine and the other regulator controls

the generator voltage output of the APU.

The two voltage regulators are

mounted at the left rear of the engine compartment.

Starter Assembly. The main engine starter (figure 35, view B) is made

by Delco-Remy. It is a 24 volt waterproof starter assembly and is mounted

on the lower left side of the engine toward the rear. It is a heavy duty,

solenoid-operated, enclosed shift-lever-type engine starter. The motor uses

12 brushes retained in 6 brush holders, accessible through an inspection

plug in the motor frame.

The starter has a heavy duty, over running,

clutch-type drive mechanism with adjustable pinion clearance.

Neutral Safety Switch. The neutral safety switch (figure 35, view C)

is mounted on the brake assembly, and functions as a safety switch to

prevent starting the main engine while the transmission shift control is in

any shift position other than P (park).

Master Relay.

This master relay switch (figure 36, view A, on page

81) is located in the left rear of the engine compartment.

It controls

primary power to all electrical systems and components with the exceptions

of the personnel heater system, the MASTER switch, and the slave receptacle.

Batteries.

Six, 6TN type, 12 volt batteries are connected in a

series-parallel circuit (figure 36, view B) and provide the vehicle with a

300 ampere-hour source of 24 volts, direct current power. The batteries are

located in the left side of the engine compartment.