Figure 24. - TM-10-3930-607-150106

ELECTRICAL

c. Operate the alternator for 15 minutes at

approximately 1500 engine RPM (approximately

3500 alternator RPM). Leave cover on regulator

to establish operating temperature. Accessories

and lights must be turned off.

d. After the 15 minute warm-up period, cycle the

alternator by the following procedure:

(1) Turn the variable resistor in the field circuit

to the full resistance position.

(2) Disconnect then reconnect the jumper lead

at the "BAT" terminal of the "Alternator."

(3) Return the variable resistor to the closed or

"no resitance" position.

(4) Bring engine speed up to 2450 RPM

(approximately 6000 alternator RPM) and note

the voltage setting. Refer to the Specification

Listing for specifications. The regulator should

be operating on the upper or shorting contacts.

If it will not operate on the upper contacts, the

Figure 24.

battery is in an extreme state of discharge, and

must be at least partially charged before

f. After making the setting, cycle the alternator as

proceeding.

covered in Step "d" above.

e. To adjust the voltage setting while operating on

Then, operate at 2450 engine RPM

the upper or shorting contacts, turn the adjusting

(approximately 6000 alternator RPM), and note

screw. (Fig. 24)

setting. Adjust if necessary.

CAUTION: Always make final setting by turning the

h. Always cycle the alternator as covered in Step

screw clockwise. This insures that the spring-

"d", before reading the final voltage setting on the

holder will be against the head of the screw. If it is

voltmeter.

necessary to turn the screw counterclockwise, turn

it until the screw head is approximately 1/8"', above

i. After making the voltage setting while operating

the adjusting bracket, then pry holder up against

on the upper set of contacts, check the voltage

screw head, then turn clockwise to make setting.

setting while operating on the lower set of contacts

as follows: Slowly increase the resistance of the

variable resistor with the engine operating at 2450

RPM (approximately 6000 alternator RPM) until

the regulator begins to operate on the lower set of

contacts. Then note the voltage reading, and

refer to Specification Listing for specifications,

B-69