Battery - TM-10-3930-627-120065

TM 10-3930-627-12

to remove regulator. Reverse this procedure to install

gravity reading of 1.220 or less in each cell indicates that

the regulator.

the battery must be recharged or replaced.

Note. A temperature corrected specific gravity

4-33. Battery

measurement is obtained by adding 0.004 to the actual

Caution: Note that alternator and regulator

hydrometer reading for each 10 degrees F the electrolyte

circuits have negative ground. Take special care that

is above 80 degrees F, or subtracting 0.004 from the

following procedures are used. Failure to follow these

actual hydrometer reading for each 10 degrees F the

procedures will result in burned out diodes and / or

electrolyte is below 80 degrees F.

alternator windings.

d. Cleaning. The top of the battery must be kept

When installing battery, always make

clean. Tighten vent plugs and clean battery with a brush

absolutely sure negative terminal of battery is grounded.

dipped in a solution of baking soda and water, followed

2. When connecting booster battery, make

by a thorough rinse with clear water. If terminals and

certain to connect negative battery terminals together

cable clamps are corroded, disconnect cables and clean

and positive battery terminals together.

in same manner as battery.

3. When connecting charger to battery, connect

4-34. Starter

charger positive lead to positive battery terminal and

a. Removal.

charger negative lead to negative battery terminal.

a. Removal.

(1) Disconnect one cable at the battery to

(1)

Loosen nuts which clamp cable

prevent shorting of tools against truck frame.

terminal to battery posts and remove cables from posts.

(2) Disconnect and tag all electrical leads

Do not remove caution tag from negative cable terminal.

at the starter solenoid.

(2)

Remove nuts securing battery

(3) Remove starter motor mounting screws

holddown angle, remove holddown angle and hook bolts.

and washers, and take starter motor from flywheel

Carefully lift out battery.

housing.

Caution: If battery top is wet, there is probably

b. Installation.

electrolyte present which is corrosive to metals and

(1) Position starter motor at mounting pad

destructive to clothing. Avoid contact and rinse battery

on flywheel housing.

freely with clear water.

(2) Install mounting bolts and washers and

Installation.

Since charging system

tighten.

components of this truck could be damaged if the battery

(3) Reconnect leads to starter solenoid.

is connected in reverse polarity, be careful to identify the

(4) Reconnect battery cable at battery.

battery posts before reconnecting cables. The ground

4-35. Distributor

cable is to be connected to the negative post.

a. Inspection.

(1) Install holddown angle and hook bolts,

(1) Inspect the distributor cap (2, fig. 4-15)

and tighten nuts on hook bolts only snug enough to hold

for cracks, carbon streaks, corroded terminals, and dirt.

battery in place. Do not draw them tight enough to exert

(2) Be certain the distributor is mounted

significant pressure on the battery case.

securely.

(2) Connect battery cables to posts.

(3) Inspect the contact points (6, fig. 4-16).

(3) Coat posts and cable clamp terminals,

Be sure they are free of burns, pits, or frosting; are

after installation, with petroleum jelly or GAA to prevent

aligned correctly; and are adjusted properly to 0.022

corrosion.

inch. Follow adjustment procedure in g below.

c. Specific Gravity Test. Specific gravity testing

(4) Inspect the rotor (1) for cracks and the

of the battery electrolyte determines the state of charge

metal contact strip for burned condition.

in each battery cell. Use a hydrometer and thermometer,

(5) Inspect electrodes for burns. Inspect

correcting the hydrometer reading for temperature. A

cable ports for dirt and corrosion.

corrected specific gravity reading of 1.260 to 1.280 in

(6) Inspect condenser for secure mounting

each cell indicates a fully charged battery. A specific

and frayed lead.

4-20