Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSHYUNDAI1999ELANTRA WAGON L4-2.0LREPAIR AND DIAGNOSISSTARTING AND CHARGINGCHARGING SYSTEMALTERNATORTESTING AND INSPECTION
1999 Hyundai Elantra Wagon L4-2.0L
Alternator: Testing and Inspection
1999 Hyundai Elantra Wagon L4-2.0LSECTION Testing and Inspection
ROTOR
1. Check the rotor coil for continuity. Check to make sure that there is continuity between the slip rings. If resistance is extremely low, it means that there is a short. If there is no continuity or if there is a short circuit, replace the rotor assembly.
Resistance value: Approx. 2.7 Ohms
2. Check the rotor coil for ground. Check to make sure that there is no continuity between the slip ring and the core. If there is continuity, replace rotor assembly.
STATOR
1. Make a continuity check on the stator coil. Check to make sure that there is continuity between the coil leads. If there is no continuity, replace stator assembly.
2. Check the coil for grounding. Check to make sure that there is no continuity between the coil and the core. If there is continuity, replace the stator assembly.
RECTIFIERS
POSITIVE RECTIFIER TEST
Check for continuity between the positive rectifier and stator coil lead connection terminal with an ohmmeter. The ohmmeter should read continuity in only one direction. If there is continuity in both directions, a diode is shorted. Replace the rectifier assembly.
NEGATIVE RECTIFIER
Check for continuity between the negative rectifier and the stator coil lead connection terminal. The ohmmeter should read continuity in only one direction. If there is continuity in both directions, a diode is shorted, and the rectifier assembly must be replaced.
DIODE TRIO TEST
Check the three diodes for continuity by connecting an ohmmeter to both ends of each diode. Each diode should have continuity in only one direction. If continuity is present in both directions, a diode is defective and the heatsink assembly must be replaced.
1. Check the rotor coil for continuity. Check to make sure that there is continuity between the slip rings. If resistance is extremely low, it means that there is a short. If there is no continuity or if there is a short circuit, replace the rotor assembly.
Resistance value: Approx. 2.7 Ohms
2. Check the rotor coil for ground. Check to make sure that there is no continuity between the slip ring and the core. If there is continuity, replace rotor assembly.
STATOR
1. Make a continuity check on the stator coil. Check to make sure that there is continuity between the coil leads. If there is no continuity, replace stator assembly.
2. Check the coil for grounding. Check to make sure that there is no continuity between the coil and the core. If there is continuity, replace the stator assembly.
RECTIFIERS
POSITIVE RECTIFIER TEST
Check for continuity between the positive rectifier and stator coil lead connection terminal with an ohmmeter. The ohmmeter should read continuity in only one direction. If there is continuity in both directions, a diode is shorted. Replace the rectifier assembly.
NEGATIVE RECTIFIER
Check for continuity between the negative rectifier and the stator coil lead connection terminal. The ohmmeter should read continuity in only one direction. If there is continuity in both directions, a diode is shorted, and the rectifier assembly must be replaced.
DIODE TRIO TEST
Check the three diodes for continuity by connecting an ohmmeter to both ends of each diode. Each diode should have continuity in only one direction. If continuity is present in both directions, a diode is defective and the heatsink assembly must be replaced.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.