Specifications

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Testing Alternator Output

When testing alternators, perform the tests in the

following sequence.

NOTE: Before testing alternator output, use an

accurate tachometer to temporarily adjust

the engine speed to the RPM specified in

the test instructions.

1. Test alternator output.

2. Test diode(s) or regulator-rectifier (if equipped).

WARNING

• UPON COMPLETION OF THE ALTERNA-

TOR OUTPUT TEST, READJUST THE

ENGINE TO THE CORRECT TOP NO-LOAD

GOVERNED SPEED!

• Correct speed is found in the Service Engine

Sales Manual Microfiche, MS-6225 or the

Service Sales Manual, MS-4052.

AVOID INJURY! Engine may

exceed safe operating speed,

causing personal injury.

AC Alternator

The AC alternator provides current for headlights

only. Current for the lights is available when the

engine is running. To check, use 12 volt lights with

a total rating of 60 – 100 watts. Alternator output

varies with engine speed. With lights rated at 70

watts, the voltage rises from 8 volts @ 2400 RPM

to 12 volts @ 3600 RPM. The lights should become

brighter as the engine speed increases.

1. Stator assembly (1), Fig. 10, is 5 amps or 14

volts AC for lighting circuit.

2. One BLACK lead from stator (2).

3. WHITE connector output lead (3).

Fig. 10

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Output Test

1. Insert RED test lead (2) into V receptacle in

meter.

2. Insert BLACK test lead (1) into COM receptacle.

3. Rotate selector to V~ (AC VOLTS) position.

4. Attach RED test lead clip to AC output terminal

(3), Fig. 11.

5. Attach BLACK test lead clip to engine ground.

6. With engine running at 3600 RPM, AC output

should be no less than 14 volts.

If NO or LOW output is found, replace the stator.

Fig. 11

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