Alternator & Regulator: Other — Mazda MX-5 NA (1989-1998)

Alternator & Regulator: Other Mazda MX-5 NA

Charging System 13 illustrations ~365 words

BELT DEFLECTION

Measure belt deflection in center of longest pulley-to-pulley span. See BELT DEFLECTION SPECIFICATIONS table. If belt deflection is not as specified, adjust as necessary.

Application			(1) Deflection - In. (mm)
B2200
New Belt			0.28-0.31 (7.0-8.0)
Used Belt			0.31-0.35 (8.0-9.0)
B2600i
New Belt			0.39-0.47 (10.0-12.0)
Used Belt			0.43-0.51 (11.0-13.0)
Miata
New Belt			0.31-0.35 (8.0-9.0)
Used Belt			0.35-0.39 (9.0-10.0)
MPV
4-Cylinder
New Belt			0.39-0.47 (10.0-12.0)
Used Belt			0.43-0.57 (11.0-13.0)
V6
New Belt			0.35-0.39 (9.0-10.0)
Used Belt			0.39-0.47 (10.0-12.0)
MX-3
4-Cylinder
New Belt			0.22-0.28 (5.5-7.0)
Used Belt			0.24-0.30 (6.0-7.5)
V6
With A/C
New Belt			0.22-0.26 (5.5-6.5)
Used Belt			0.26-0.30 (6.5-7.5)
Without A/C
New Belt			0.24-0.28 (6.0-7.0)
Used Belt			0.28-0.31 (7.0-8.0)
MX-6 & 626
4-Cylinder
New Belt			0.26-0.28 (6.5-7.0)
Used Belt			0.28-0.35 (7.0-9.0)
V6
With A/C
New Belt			0.22-0.26 (5.5-6.5)
Used Belt			0.26-0.30 (6.5-7.5)
Without A/C
New Belt			0.24-0.28 (6.0-7.0)
Used Belt			0.28-0.31 (7.0-8.0)
Protege & 323
New Belt			0.31-0.35 (8.0-9.0)
Used Belt			0.35-0.39 (9.0-10.0)
RX7
New Belt			0.24-0.31 (6.0-8.0)
Used Belt			0.28-0.35 (7.0-9.0)
929
New Belt			0.39-0.47 (10.0-12.0)
Used Belt			0.43-0.51 (11.0-13.0)
(1) With 22 lbs. (10 kg) applied to belt.

(1)	With 22 lbs. (10 kg) applied to belt.

BELT DEFLECTION SPECIFICATIONS

Miata

Obtain code number and deactivate audio anti-theft system before disconnecting battery.

All Models

DO NOT reverse battery cable connections. Rectifier will be damaged.
DO NOT use high voltage type testers.
Battery voltage is always present at terminal "B".
DO NOT ground terminal "L" while engine is running.
DO NOT start engine with connector disconnected from terminals "L" and "S".
DO NOT apply battery voltage to terminal "L".

ALTERNATOR OUTPUT

Connect an ammeter (100-amp minimum) in-line between terminal "B" connector and wire. (Scheme 12), (Scheme 13) or (Scheme 14). Turn headlights and all accessories on. Depress brake pedal. Operate engine at 2500-3000 RPM.
If amperage is not as specified in ALTERNATOR MAXIMUM RATED OUTPUT table, repair or replace alternator as necessary. If amperage is as specified, turn off headlights and all accessories. Release brake pedal. Operate engine at 2500-3000 RPM. If amperage is not about 5 amps or more, repair or replace alternator as necessary.
If amperage is about 5 amps or more, measure voltage between ground and terminals "S" and "L" while operating engine at 2500-3000 RPM. If 14.1-14.7 volts is not present, repair or replace alternator as necessary. If 14.1-14.7 volts is present, alternator output is okay.

Application		Amps
B2200		55
B2600i		60
Miata
A/T		65
M/T		60
MPV		70
MX-3
4-Cylinder		70
V6		90
MX-6 & 626
4-Cylinder		80
V6		90
Protege & 323		65
RX7		100
929		90

ALTERNATOR MAXIMUM RATED OUTPUT

Scheme 12

Scheme 13

Scheme 14

Rotor & Slip Rings

Measure resistance between rotor slip ring contacts. (Scheme 20)thru (Scheme 24). If resistance is not within specification, replace rotor. See ROTOR RESISTANCE SPECIFICATIONS table. Check continuity between individual slip rings and rotor core/shaft. If there is continuity, replace rotor.

Application	Ohms
B2200, B2600i, Miata, Protege & 323	3.5-4.5
MPV	2.7-2.9
MX-3 & RX7	(1)
MX-6 & 626	2.5-3.5
(1) Information is not available from manufacturer.

(1)	Information is not available from manufacturer.

ROTOR RESISTANCE SPECIFICATIONS

Stator

Check continuity between stator coil leads and stator core. (Scheme 20)thru (Scheme 24). If there is continuity, replace stator. Check continuity between leads of stator coil. If there is no continuity, replace stator.