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Volvo 850 alternator & regulator service manual

Volvo 850 S70 V70 C70 service & repair manual

ALTERNATOR & REGULATOR

1995 Volvo 850

1995-96 STARTING & CHARGING SYSTEMS Volvo Alternators & Regulators
850
NOTE: Some Volvos are equipped with a Nippondenso generator.
Testing information on these generators is not available from the manufacturer.

DESCRIPTION

Bosch generators are a conventional 3-phase, self-rectifying type. Bosch 55-amp through 75-amp generators have 3 positive and 3 negative diodes connected to stator windings to rectify current. Bosch
80-amp through 120 amp generators have 14 diodes. All generators use 3 exciter diodes connected to stator windings. These diodes turn off the generator indicator light and supply power to voltage regulator while engine is running. Voltage regulator is transistorized.

ADJUSTMENTS

No adjustments or maintenance is required on generator or voltage regulator.

TROUBLE SHOOTING

NOTE: See TROUBLE SHOOTING – BASIC PROCEDURES article in GENERAL INFORMATION.

ON-VEHICLE TESTING

WIRING CONTINUITY TEST

1) Connect a voltmeter between generator B+ terminal and ground. Voltmeter should indicate battery voltage. If battery voltage is not indicated, check wiring between generator and battery.
2) Turn ignition on and ensure generator indicator light comes on. If light does not come on, check wiring between generator and warning light.

VOLTAGE DROP TEST – POSITIVE SIDE

1) Connect a voltmeter between positive battery terminal and generator B+ terminal. Start engine and run at 2000 RPM. Turn on headlights, rear window defogger and heater blower.
2) If voltage drop is more than .2 volt, check circuit between generator B+ terminal and starter for corroded or loose connections. Also, check circuit between starter and battery positive terminal.

VOLTAGE DROP TEST – GROUND SIDE

1) Connect a voltmeter between negative battery terminal and generator housing. Start engine, and run it at 2000 RPM. Turn on headlights, rear window defogger and heater blower.
2) If voltage drop is more than .2 volt, check battery
terminals, chassis grounds and engine grounds for corroded or loose connections.

OUTPUT TEST

1) Ensure connections at battery, generator, and starter are clean and tight. Ensure generator, engine and body are properly grounded. Ensure generator drive belt is tight and in good condition.
2) Connect ammeter following manufacturer’s instructions. Connect voltmeter leads to battery terminals. Run engine to 2000 RPM. Adjust carbon pile on tester until voltmeter reads 12 volts. Generator output should be 49-55 amps. (55-amp generator), 63-70 amps (70-amp generator), 31-80 amps (80-amp generator), 81-90 amps (90-amp generator). If generator output is low, replace generator.

OVERHAUL

NOTE: Use illustration for exploded view of Bosch generator.
volvo 850 s70 v70 c70 alternator regulator bosch servicing overhaul manual repair
Illustration of Nippondenso generator is not available from manufacturer. See Fig. 1.
Fig. 1: Exploded View Of Bosch Generator (Typical) Courtesy of Volvo Cars of North America.

GENERATOR SPECIFICATIONS

GENERATOR SPECIFICATIONS (BOSCH)
Part No. Amps

0

120

213

007

………………………………….

100

0

120

411

577

…………………………………..

80

0

120

465

006

………………………………….

120

0

120

465

012

………………………………….

100

0

120

465

018

………………………………….

100

0

120

468

010

………………………………….

100

0

120

468

016

………………………………….

100

0

120

469

787

…………………………………..

80

0

120

469

789

…………………………………..

80

0

120

469

793

…………………………………..

80

0

120

469

935

…………………………………..

80

0

120

469

993

…………………………………..

80

0

120

469

995

…………………………………..

80

0

120

469

997

…………………………………..

80

0

120

488

131

…………………………………..

55

0

120

488

230

…………………………………..

65

0

120

488

231

…………………………………..

65

0

120

488

260

…………………………………..

55

0

120

488

262

…………………………………..

65

0

120

510

348

………………………………….

120

0

120

510

423

………………………………….

100

0

120

545

002

………………………………….

100

0

123

213

006

………………………………….

100

0

123

310

017

…………………………………..

80

0

123

310

030

…………………………………..

80

0

123

500

004

………………………………….

100

0

123

545

001

………………………………….

100

0

123

545

003

………………………………….

120

GENERATOR SPECIFICATIONS (NIPPONDENSO)
Part No. Amps
100 211-8370 …………………………………… 80
100 211-8620 ………………………………….. 100
100 211-8630 ………………………………….. 100
100 211-8960 …………………………………… 80

WIRING DIAGRAMS

volvo 850 s70 v70 c70 alternator regulator bosch wiring diagram diagrams
Fig. 2: Charging System Wiring Diagram (1995-96)

 

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