Craftsman 143.991200 Specifications download pdf (Page 45)

3 AMP DC ALTERNATOR SYSTEM -

DIODE IN HARNESS SLEEVE

This system has a diode included in the red wire which

converts the alternating current (A.C.) to direct current.

The direct current (D.C.) is used to provide a trickle

charge for the battery. The leads from the alternator

and the type of connector may vary, but the output

readings will be the same.

CHECKING THE SYSTEM: Remove the fuse from

fuse holder and check the fuse to make certain it is

good. If faulty, replace with a six (6) AMP fuse.

To check D.C. output, separate the connectors at the

engine. Place the probe (+) in the red wire lead

connector. Ground the other probe to the engine (diag.

11).

With the engine running minimum values should read:

2500 R.P.M. - 8.0 Volts D.C.

3000 R.P.M. - 9.5 Volts D.C.

3300 R.P.M. -10.5 Volts D.C.

3600 R.P.M. -11.5 Volts D.C.

If one of these minimum readings are noted, the

system is okay. Check for bad battery, ammeter, wiring,

etc.

If no reading or less than the above reading, proceed

to make an A.C. output check by pulling back the

protective coating from the wire on the alternator side

of the diode. Test the A.C. voltage before the diode

using an A.C. voltmeter.

With the engine running minimum values should read:

2500 R.P.M. - 18.0 Volts A.C.

3000 R.P.M. - 22.0 Volts A.C.

3300 R.P.M. - 24.0 Volts A.C.

3600 R.P.M. - 26.0 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.

To replace the diode, disconnect at plug (spade

terminal) and cut the wire on the opposite end of the

diode at the solderless (crimped) connector. Remove

1/4" (6.35 mm) of insulation from the cut end of the

wire and twist the strands together. Place the

solderless connector from the new diode onto the

exposed 1/4" (6.35 mm) wire and crimp the connector

with a standard electricians pliers. Reconnect plug end

(or spade connector (diag. 12).

NOTE: DO NOT USE ACID CORE SOLDER. BE

CAREFUL NOT TO APPLY HEAT DIRECTLY TO THE

DIODE - USE A HEAT SINK.

New heat shrink tubing can be installed by slipping

over the wires and heating with a hot air gun. If this is

not available, tape the diode and connections with

electrical tape.

GREEN

DIODE

RED

IF BULB DOES NOT LIGHT OR LIGHTS WHEN

POLARITY REVERSED, DISCARD DIODE.

D.C.

FUSE HOLDER

SOLDERLESS

CONNECTOR

SPADE

CONNECTOR

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Craftsman 143.991200 Specifications Page 45

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