Battery and Cables

TM 10-3930-633-12

normal temperature operation, or 1.265 minimum

spark should jump from the high tension terminal

for cold temperature operation. For constant

to ground as the engine is cranked. If no spark is

operation in above-freezing temperatures,

visible, and if all wiring is intact, the coil may be

electrolyte strength may be reduced to 1.225 by

faulty.

diluting with distilled water. If the battery is not

b. Removal.

fully charged, charge it.

(1) Tag and disconnect the primary wiring

(2) Connect a voltmeter across the terminals

from the coil terminals.

of the battery, and note the reading. Pull the high

(2) Refer to figure 4-16 and disconnect

tension cable from the ignition coil, crank the

distributor high tension lead (4) from coil (5).

engine with the starter, and note the reading on

(3) Loosen screw (11) and slide coil (5) out of

the voltmeter. If the difference between the two

mounting strap (8).

readings is more than 4 volts or the second

c. Installation.

reading is less than 8 volts, replace the battery.

(1) Slide the coil (5) into the strap (8) and

c. Battery a n d C a b l e R e m o v a l a n d

tighten screw (11) to hold coil in position.

Replacement.

(2) Connect high tension lead (4) to coil

terminal.

NOTE

Always disconnect the battery ground cable first

(3) Connect primary wiring to coil terminals

when replacing battery or cables. On rein-

as shown in diagram, figure 4-6.

stallation, connect battery ground cable last.

4-41. Battery and Cables

(1) Loosen the nuts on the battery cable

a. Battery Cleaning.

terminals and disconnect the cables from the

(1) Raise the engine hood to gain access to

battery posts. Clean cable terminals as outlined in

the battery and battery cable connections.

subparagraph a above.

(2) Remove dirt and grease accumulated on

(2) Refer to figure 4-17 and remove the nuts

the battery with a clean cloth.

(6) on the battery hold-down studs (10) at each

(3) Pour a solution of baking soda and water

end of the battery. Lift off the hold-down frame

on the top of the battery to neutralize any acid

(9) and remove the battery (14) from the vehicle.

present. Continue to pour until the solution no

(3) Remove the starting motor mounting

longer bubbles when it contacts the battery.

bolt and lockwasher that secure the ground cable

(4) Remove any corrosion from battery

to the cylinder block; remove the cable.

terminals by scrubbing with a solution of baking

(4) Remove the nut and lockwasher that

soda, or ammonia, and water.

secure the positive battery cable to the solenoid

CAUTION

switch mounted on the starting motor; remove

Remove ground (negative ) cable first.

the cable.

When installing cables, install ground

(5) Install new cables. Make certain the

cable last.

connections at the cylinder block and starter

(5) Loosen the nuts that secure the battery

solenoid are clean and tight.

cables to the battery posts; remove the cables.

(6) Install new battery (14) and secure with

Clean all corrosion from the cable clamps and

hold-down frame (9) and nuts (6) on hold-down

posts with a wire brush or jackknife. Replace the

studs (10). Make certain the battery posts are in

cables; tighten the nuts.

the proper position; negative post towards the

(6) Lightly coat the battery posts and cable

front.

clamps with high temperature grease.

(7) Connect cable terminals to battery posts

b. Battery Testing.

and tighten terminal screws. Coat terminals with

(1) Test the state of the electrolyte using a

a light film of high temperature grease to retard

hydrometer. The specific gravity of the elec-

corrosion.

trolyte at 750 F shall be 1.225 minimum for

4-29