Craftsman 143.991200 Specifications download pdf (Page 48)

INSERT PROBES INTO

CONNECTOR SLOTS DO

NOT REMOVE

CONNECTOR WIRES

A.C. VOLTMETER

YELLOW

CAUTION: BLOWER

HOUSING MUST BE

INSTALLED WHEN

RUNNING ENGINE

MAGNETO GROUND - GREEN

D.C. OUTPUT LEAD-RED

Models OHV 13.5 - 17

(Read between Engine and Diode)

2500 R.P.M. - 17.0 Volts A.C.

3000 R.P.M. - 21.0 Volts A.C.

3600 R.P.M. - 24.5 Volts A.C.

If low or no voltage is experienced, replace the

alternator. If the alternator puts out the minimum A.C.

voltage, replace the diode.

RED

7 Amp D.C. Alternator System Regulator-

Rectifier Under Engine Housing

In this system, the regulator and rectifier are combined

in one solid state unit mounted under the blower

housing of the engine.

Various types of regulator-rectifiers have been used

on different applications. Test procedures for all types

are the same. However, regulator styles are not

interchangeable (diag. 20).

CHECKING THE SYSTEM: An open circuit D.C.

voltage check cannot be made with this system. If a

known good battery fails to maintain a charge,

proceed to make an A.C. voltage test.

To do this, the blower housing must be removed, and

the regulator-rectifier must be brought outside of the

blower housing.

Keep the A.C. leads attached to the regulator-rectifier.

Install the blower housing with the regulator-rectifier

outside the housing. With an A.C. voltmeter probe

the regulator as shown (diag. 21)

CAUTION: AT NO TIME SHOULD THE

ENGINE BE STARTED WITH THE BLOWER

HOUSING REMOVED.

With engine running, minimum A.C. voltage from lead

to lead should be:

2500 R.P.M. - 16.0 Volts A.C.

3000 R.P.M. - 19.0 Volts A.C.

3300 R.P.M. - 21.0 Volts A.C.

3600 R.P.M. - 23.0 Volts A.C.

If the minimum readings are noted, the alternator is

okay. If the system fails to charge a known good

battery, the regulator-rectifier is defective.

YELLOW

RED

DIODE

A.C.

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Craftsman 143.991200 Specifications Page 48

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