CORRECTION FOR AMBIENT TEMPERATURE

ELECTRICAL

Before making any electrical checks, visually inspect all

NOTE: Never use emery cloth or

connections, including the slip-on connectors at the

sandpaper to clean contact points.

regulator and alternator to make sure they are clean and

tight, then proceed. Since the regulator terminals are of

E. CORRECTION FOR AMBIENT TEMPERATURE

the slip-on type, a special cable assembly or adapter

must be used during testing so that meter connections

It is important to remember that the voltage setting for

can be made to the terminals.

one type of operating condition may not be satisfactory

for a different type of operating condition. Vehicle

CAUTION: To check the charging system, insert the

underhood temperatures, operating speeds, and

adapter into the regulator, making connections only

nighttime service all are factors which help determine

the proper voltage setting.

The proper setting is

as shown in the illustrations. Avoid contact with the

attained when the battery remains fully charged with a

units when replacing the regulator cover.

minimum use of water.

B. UNDERCHARGED BATTERY

If no circuit defects are found, yet the battery remains

undercharged, raise the setting by .3 volt, and then

NOTE: This condition, as evidenced

check for an improved battery condition over a service

by slow cranking, can be caused by

period of reasonable length. If the battery remains

one or more of the following

overcharged, lower the setting by .3 volt, and then

conditions:

check

for

improved

battery

condition.

Recommended voltage setting procedures are charted

1. A loose alternator drive belt.

below.

2. A defective battery.

Ambient Temperature

Voltage Setting

Degrees

3. Malfunction of field relay.

13.9-1.,0

13.8-14.8

4. A defective alternator.

13.7-14.6

105

13.5-14.4

125

5. A low voltage regulator setting.

13.4-14.2

145

13.2-14.0

165

1. Loose Drive Belt: The drive belt should be

13.1-13.9

185

tightened to specification.

NOTE: Operation on lower contacts

2. Defective Battery: A battery which is sulphated,

must be .1 to .4 volt lower than on

or one with an intermittent open at a terminal post or in

upper contacts.

one of the cell connectors, will remain in an uncharged

condition under normal operating conditions.

CHECKING THE ALTERNATOR CHARGING SYSTEM

3. Malfunction of Field Relay: To check the relay,

A. GENERAL

make connections to the adapter as shown in Figure 29;

turn the switch to the "IGN" position, and observe the

Trouble in the charging system will usually show up as

voltmeter. The reading should be battery voltage. If the

an undercharged battery or an overcharged battery.

reading is zero, either the line between the

B-72