alternator_replacement with wiring diagrhams.pdf

For Briggs & Stratton Discount Parts Call 606-678-9623 or 606-561-4983

www.mymowerparts.com

Alternator Identification

Briggs & Stratton engines are equipped with a number of different alternator systems to meet the require-

ments of equipment manufacturers. For example, a large lawn tractor with accessories may require a

16 amp regulated system, whereas a snow thrower with a single headlight requires an AC Only system.

Knowing the type of alternator system an engine is equipped with is important, particularly when an en-

gine is being replaced.

Briggs & Stratton alternator systems are easily identified by the color of the stator output wire(s) and the

connector.

Stator Output Wire(s)

And Connector

(typical)

DC Only

AC Only

ONE BLACK LEAD

FROM ENGINE

(STATOR)

ONE RED LEAD

FROM ENGINE

(STATOR )

RED

CONNECTOR

TO EQUIPMENT

HARNESS

DIODE

WHITE CONNECTOR

OUTPUT LEAD

TO EQUIPMENT

HARNESS

• 14 Volts AC for lighting circuit.

• One black lead from stator.

• White connector output lead.

• 3 amp DC unregulated for charging battery.

• One red lead from stator.

• Diode encased at connector.

• Red connector output lead.

Dual Circuit

10 or 16 amp Regulated

BLACK LEAD

AC OUTPUT

RED LEAD

DC OUTPUT

TO EQUIPMENT

HARNESS

RED AND BLACK

LEADS FROM ENGINE

(STATOR)

RED CONNECTOR

OUTPUT LEAD

DC CHARGING CIRCUIT

RED LEAD

TWO BLACK LEADS

FROM ENGINE

(STATOR)

ONE RED

LEAD

WHITE

CONNECTOR

TO EQUIPMENT

HARNESS

WHITE LEAD

AC FOR LIGHTS

• 3 amp DC unregulated for charging battery

(ONE red lead from stator).

• 14 Volts AC for lighting circuit

(ONE black lead from stator).

• Diode encased at connector.

• White connector with two pin terminals.

YELLOW

CONNECTOR

REGULATOR

RECTIFIER

TWO YELLOW LEADS

• 10 or 16 amp DC regulated for

charging battery.

• Alternator output is determined by the flywheel

alternator magnet size.

• 10 and 16 amp system use the same stator,

color coding and regulator-rectifier.

• Two black leads from stator.

• Yellow connector with two pin terminals.

• Two yellow leads to regulator-rectifier.

• One red lead from regulator-rectifier to red

connector output lead.

Tri-Circuit

ONE BLACK LEAD

FROM ENGINE

(STATOR)

TO EQUIPMENT

HARNESS

5 AMPS DC (-)

TO LIGHTS

WHITE LEAD

TWO DIODES ENCASED

IN WIRE HARNESS

GREEN

CONNECTOR

RED LEAD 5 AMPS DC ( + )

TO BATTERY AND CLUTCH CIRCUIT

493219 Regulator/Rectifier

Used With Charge Indicator Circuit

• 10 amp AC.

• One black lead from stator.

• Green connector.

• Two diodes encased in wire harness.

• Red and white output leads.

TO EQUIPMENT

HARNESS

RED WIRE AND RAISED

RIB INDICATES DC OUTPUT

BLUE WIRE

CHARGING INDICATOR

WHITE

CONNECTOR

5 or 9 amp Regulated

EQUIPMENT

HARNESS

ONE BLACK LEAD

FROM ENGINE

(STATOR)

RED

CONNECTOR

GREEN

CONNECTOR

YELLOW

WIRE

TWO YELLOW

LEADS

493219 REGULATOR

RECTIFIER

YELLOW

CONNECTOR

REGULATOR

RECTIFIER

• 5 or 9 amp DC regulated for charging battery.

• Alternator output (5 or 9 amp) is determined by

flywheel alternator magnet size.

• Uses same stator as Tri-Circuit system.

• One black lead from stator.

• Green connector.

• Uses same stator as 10 and 16 amp system.

• DC output the same as 10 or 16 amp system.

• Charge indicator light and wiring supplied by

equipment manufacturer.

• Red DC output wire to white connector.

• Blue charge indicator wire to white connector.

Engine/Alternator Replacement Information

With the exception of the AC Only alternator, all of the alternator systems referred to in this book have

a battery as part of the electrical system.

There are specialized applications that use an alternator without a battery. An example would be certain

generators or welders that use alternator output to excite an electrical field. For the equipment to function,

the alternator output must be very evenly matched to the equipment requirements. When replacing an

engine in these applications, the alternator must be the same as the original.

Replacing Briggs & Stratton Engines

When replacing an older Briggs & Stratton engine on a piece of equipment with a newer Briggs & Stratton

engine, sometimes the newer engine has an alternator system different from the alternator system on

the original engine. This means that the output connector on the replacement engine is not compatible

with the original wiring harness on the piece of equipment. For example, the original engine may have

been equipped with a Dual Circuit system and the replacement engine is equipped with a regulated sys-

tem. We can integrate the two systems by making an adapter harness from readily available parts.

Generally an unregulated DC system (DC Only, Dual Circuit) should not be used to replace a regulated

system because alternator output may not be sufficient for equipment requirements. However, because

the equipment requirements are usually much less on an unregulated DC system, a regulated system

may be used as a replacement. The regulator/rectifier prevents the battery from being over charged.

NOTE: The AC Only, DC Only, Dual Circuit, Tri-Circuit as well as the 5 and 10 amp regulated systems

use flywheels with small alternator magnets. The 9 and 16 amp regulated systems use flywheels with

the large alternator magnets. See figure below for magnet sizes.

*Small Magnet

7/8” x 11/16”

(22mm x 18mm)

ALTERNATOR

MAGNETS

*Large Magnet

1-1/16” x 15/16”

(27mm x 24mm)

* V Twin Alternator Magnet Size: Small 7/8” x 21/32” (22 mm x 17 mm)

Large 7/8” x 29/32” (22 mm x 23 mm)

The following are alternator replacement combinations which require an adapter harness. All

of the necessary components are shown.

1. Original engine equipped with AC Only alternator.

Replacement engine equipped with Dual Circuit alternator.

Modify 393362 harness supplied with replacement engine by removing red DC wire. Then, splice

393537 connector into white AC wire and connect to equipment harness.

EQUIPMENT

HARNESS

AC WIRE

(WHITE)

DUAL CIRCUIT CONNECTOR

(FROM ENGINE)

393362

HARNESS

BLACK

RED

SPLICE

393537

CONNECTOR

(GREEN)

RIB

2. Original engine equipped with DC Only alternator.

Replacement engine equipped with Dual Circuit alternator.

Modify 393362 harness supplied with replacement engine by removing white AC wire. Then, splice

393537 connector into red DC wire and connect to equipment harness.

DUAL CIRCUIT CONNECTOR

(FROM ENGINE)

EQUIPMENT

HARNESS

393362

HARNESS

DC WIRE

(RED)

BLACK

RED

SPLICE

RIB

393537

CONNECTOR

(GREEN)

RIB

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika: