Alternator Output Test

NOTE: During alternator output test, a slightly discharged battery should be used as a fully charged battery may not allow full alternator output.

Turn ignition switch to "OFF" position. Disconnect negative battery cable. Disconnect alternator output wire from terminal "B". Install a 100-amp ammeter in series to terminal "B" and disconnected output lead. Install positive lead of ammeter to terminal "B" and negative lead to disconnected output wire.
CAUTION: Each connection should be tightened with bolts as excessive current flow will exist. DO NOT use clips on ammeter.
Connect a voltmeter (0-20 volts) between terminal "B" and ground. Connect positive voltmeter lead wire to alternator terminal "B" and negative wire to ground. Install tachometer and negative battery cable.
Ensure voltmeter indicates battery voltage. If no voltage exists, an open circuit is present in wire between alternator terminal "B" and battery negative terminal. Check grounds and fusible link.
Turn headlights on and start engine. Set headlights at high beam and heater switch on "HIGH". Quickly accelerate engine speed to 2500 RPM and note alternator output current on ammeter. Minimum output should be within specification. See ALTERNATOR OUTPUT SPECIFICATIONS table.
NOTE: Output voltage changes with electrical load and temperature. Ensure proper electrical load is applied while checking output. Nominal output may not be obtained if alternator or ambient temperature is excessive. Allow to cool and recheck output. Alternator output is stamped on metal plate attached to alternator case.
If minimum output is not obtained and alternator wiring is okay, repair alternator. Disconnect negative battery cable and remove test equipment.

ALTERNATOR OUTPUT SPECIFICATIONS

Application		Minimum Output Amps
Starion		52
Galant & Sigma		53
Mirage		52.5
Montero
2.6L		35
3.0L		52.5
Pickup		31
Precis		42
Van/Wagon		52