alternator and regulator 2.pdf part of Nissan 90 ~93 alternator and regulator 2.pdf, Nissan B13 alternator and regulator 2 text manual preview

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ALTERNATOR & REGULATOR - MITSUBISHI
1993 Nissan Sentra

1993 ELECTRICAL Nissan Alternators & Regulators - Mitsubishi NX, Quest, Sentra, 240SX, 300ZX NOTE: If vehicle is equipped with Hitachi alternator, see ALTERNATOR & REGULATOR - HITACHI article in the ELECTRICAL section.

DESCRIPTION
Conventional 3-phase, self-rectifying Mitsubishi alternator contains 6 diodes (3 positive and 3 negative). Diodes rectify current. Regulator is inside alternator.

ADJUSTMENTS BELT TENSION
ALTERNATOR BELT ADJUSTMENT Application

NX & Sentra 1.6L ..................................... .28-.35 (7-9) 2.0L (With A/C) .......................... .28-.31 (7-8) 2.0L (Without A/C) ....................... .31-.35 (8-9) Quest .................................. .26-.29 (7.5-8.5) 240SX ...................................... .28-.31 (7-8) 300ZX ...................................... .28-.31 (7-8) (1) - Deflection is with 22 lbs. (10 kg) pressure applied midway on the longest belt run.

NOTE:

NOTE:

Alternator Test 1) Turn ignition on. If charge indicator light on instrument panel comes on, go to step 3). 2) If light is off, disconnect alternator connector (terminals "L" and "S"). Ground terminal "L". If light comes on, repair or replace alternator and/or replace regulator. If light remains off, replace indicator bulb, reconnect alternator connector and retest. 3) Start and run engine at idle. If charge indicator light is

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TROUBLE SHOOTING
See TROUBLE SHOOTING - BASIC PROCEDURES article in GENERAL INFORMATION.

(1) Deflection In. (mm)

ON-VEHICLE TESTING
Before testing, ensure alternator wire harness connections are secure, drive belt tension is okay and battery is fully charged. After starting engine, wait at least 30 seconds before measuring voltage. Terminals "B", "E", "L" and "S" are marked on the alternator's rear cover.

dim, flickers or remains on (bright), repair or replace alternator. If light goes off, run engine at 1500 RPM with headlights on. If light comes on, repair or replace alternator. 4) If light remains off, measure voltage at terminal "B" with engine running at 1500 RPM. If more than 15.5 volts are present, replace regulator. If voltage is 13-15 volts, alternator and regulator are okay. Ensure alternator output amperage is as specified. See ALTERNATOR OUTPUT AMPERAGE SPECIFICATIONS table. ALTERNATOR OUTPUT AMPERAGE SPECIFICATIONS Application

NX & Sentra .................................... 65 Quest .......................................... 85 240SX .......................................... 60 300ZX ................................ 65 @ 2500/90

Rotor Connect one ohmmeter lead to each rotor slip ring. If about 2-3 ohms resistance is present, rotor is okay. If about 2-3 ohms resistance is not present, rotor is defective. Connect an ohmmeter lead to any slip ring, and connect remaining lead to rotor core. If continuity exists, replace rotor assembly. MINIMUM SLIP RING DIAMETER Application All Models NOTE:

Stator Using ohmmeter, check continuity between stator core leads. If continuity is not present between leads, replace stator. Connect one ohmmeter lead to stator core. Connect remaining ohmmeter lead, in turn, to each of the stator leads. If continuity is not present, stator is good. If continuity exists, stator is grounded. Replace stator. Diodes Using an ohmmeter, check continuity of all diodes in both directions. Continuity should exist in only one direction. If continuity exists in both directions, diode is shorted. See Fig. 1. If continuity is not present in either direction, diode is open. If any diode is defective, replace entire diode assembly.

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@ @ @ @

Output Amps @ RPM 2500 2500 2500 5000

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BENCH TESTING

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In. (mm) .87 (22)

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To test stator or diodes, separate them by unsoldering connecting wires. Use just enough heat to melt solder. Excess heat will damage diodes.

Fig. 1: Testing Diode Assembly Courtesy of Nissan Motor Co., U.S.A. Brushes Inspect brushes for freedom of movement in holder. Clean brush holder if necessary. Check brushes for cracks and wear. Check brush springs for corrosion or damage. Ensure brushes are at least . 31" (8 mm) long.

OVERHAUL
NOTE: A ring is used to lock outer bearing race in alternator's rear cover. It may be necessary to heat bearing housing to remove cover. Use 200-watt soldering iron to heat housing. DO NOT use heat gun, as it may damage diode. For exploded view of alternator, see Fig. 2.

Fig. 2: Exploded View Of Typical Mitsubishi Alternator Courtesy of Nissan Motor Co., U.S.A.

WIRING DIAGRAMS

Proceed to appropriate WIRING DIAGRAM article listed below in WIRING DIAGRAMS section. * * * * * WIRING WIRING WIRING WIRING WIRING DIAGRAMS DIAGRAMS DIAGRAMS DIAGRAMS DIAGRAMS (for (for (for (for (for NX). Quest). Sentra). 240SX). 300ZX).