Table 4-4. Voltage Table

Figure 4-23. Checking voltage regulator setting.

specified range, remove the pipe plug (fig. 4-23) from

Note. Either terminal is satisfactory for

regulator cover and note the position of the plastic screw

this check provided a lead is connected to it.

slot beneath the plug. The slot will be lined up with one

of the divisions or lines cast in the regulator cover.

(3) Compare the voltage obtained in step (2)

Each division represents a voltage differential of 0.3

with voltage table 4-4. Ambient temperature is the

volt. Add or subtract 0.3 volt for each division from the

temperature of the air measured 1/4 inch from the

zero mark to the specified voltage limits in table 4-4.

regulator cover.

(4) If the actual voltage is not within the

Table 4-4. Voltage Table

Ambient

105

125

temperature

145

(Deg F)

Normal

14.1

13.9

13.7

13.5

13.4

Voltage

Setting

14.9

14.7

14.5

14.3

14.2

(Volts)

(5) If the voltmeter reading does not fall

(b) If the battery is consistently

within the specified limits outlined in table 4-4, replace

undercharged, (evidenced by the inability to crank the

the regulator. If the reading does fall within the

engine) at the regulator's present setting, increase the

prescribed limits, but the battery is either overcharged or

voltage setting by 0.3 volt and check for improved

undercharged, the regulator should be adjusted as

condition over a reasonable service period. If necessary,

outlined in the next step.

repeat this process until the battery remains charged

(6) Voltage setting adjustment.

with a minimum use of water.

(a) the battery uses too much water at

b. Removal.

the voltage regulator's present setting, reduce the

(1) Tag and disconnect the leads to the

voltage setting by 0.3 volt, one division on cover, and

voltage regulator.

check for decreased battery water usage over a

(2) Remove three capscrews lockwashers,

reasonable period of time. If necessary, repeat this

and nuts; remove the voltage regulator.

process until the battery remains charged with a

c. Installation. Install regulator by direct reversal of

minimum use of water.

removal.

4-27