Figure 2-18. Generating system wiring

TM-9-2320-211-20 Truck Chassis: 5-Ton 6x6 M39 M39A2 M40 M40A1 M40A2 M40A1C M40A2C M61 M61A1 M61A1 M61A2 M63 M63A1 Manual
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TM 9-2320-211-20

d. C h e c k all c o n n e c t i n g c a b l e s f o r p r o p e r

connections and insure that they are clear of metal

objects on the vehicle.

e. Connect the battery ground cable.

f. Open both links on the generator-mounted

a d a p t e r and, w i t h the lead connected to 24-volt

positive (+) source, just touch the field lead of the

generator. This will insure that the generator has

the correct polarity.

g. Connect the ammeter positive (+) lead to the

load bank side of the ammeter, 24-VOLTS, 10-

8 0 A , and connect the other end to the armature

l e a d of the generator as shown in figure 2-19.

D Battery-generator indicator

Batteries

Figure 2-19. Generator output test hookup.

Ignition switch

h. Connect the ammeter negative (--) lead to the

Generator-regulator

Generator

meter side (fig. 2 - 8 ) , 5 0 A M P . a n d c o n n e c t t h e

Slave receptacle

other end to the vehicle generator ground or battery

Radio receptacle

g r o u n d (fig. 2-19).

Circuit

Cable

i. Connect the positive (+) lead of the voltmeter

No.

gage

Circuit description

(fig. 2-8) to the positive (+) s i d e o f t h e m e t e r

Battery to regulator A terminal

connection and other end to the armature side of

Battery ground

t h e generator (fig. 2-19).

Ignition switch to battery indicator

j. Connect the negative (--) lead to the negative

Regulator (shunt) to circuit breakers

Battery to radio receptacle (feed)

(--) side of the meter (fig. 2-8), and the o t h e r e n d

Battery to slave receptacle ( + )

to the vebicie frame or batter-y ground.

Slave receptacle to battery ( -- )

k. Select the 50-volt scale (fig. 2-8).

Battery interconnecting cable

1. Connect one lead of the variable resistance to

Radio receptacle to battery (ground)

the generator armature, and the other lead to the

Figure 2-18. Generating system wiring.

g e n e r a t o r field (fig. 2-16 and 2-19).

Disconnect the generator-to-regulator cable at

m. With the meters counected as in figare 2-19,

the generator and insert the adapter as shown in

and the variable resistor and L O A D B A N K

figure 2-16. Refer to figure 2-18 for the generator

S W I T C H in the OFF position, start the engine and

system wiring layout.

set it to run at a high idle (1000 to 1200 rpm).

b . Disconnect the battery-to-regulator cable at

n. With the L O A D B A N K S W I T C H in the

t h e vehicle regulator and insert the adapter as

OFF position, move the variable field rheostat and

shown in figure 2-17.

observe the voltmeter. When 30-volts is shown on

c. Check all connecting links to make sure they

meter, stop turning the field rheostat.

are closed and not touching any metal on the

o. If no voltage is registered, check to see that

vehicle.

2-37

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