Charging System - Troubleshooting

~1min read

Symptom Possible Cause Remedy
Battery charge warning light does not illuminate with ignition on and engine off Blown fuse / Burned-out bulb / Loose wiring connection / Faulty electronic voltage regulator Check the fuse / Replace the bulb / Restore the connection at the wiring terminals / Replace the voltage regulator
Battery charge warning light does not go out with engine running (battery requires prolonged charging) Alternator drive belt loose or worn / Poor battery terminal contact due to corrosion, wear or loose attachment / Blown fuse / Blown fusible link / Faulty electronic voltage regulator or alternator / Wiring defect Adjust belt tension or replace belt / Repair or replace terminals or wiring / Check fuse / Replace fusible link / Check alternator / Repair wiring
Battery discharged Alternator drive belt loose or worn / Open circuit or loss of contact in wiring / Blown fusible link / Faulty warning light or field coil resistor / Poor ground connection / Faulty voltage regulator or alternator / Faulty battery Adjust belt tension or replace belt / Repair or restore contact at connections / Replace fusible link / Replace components / Repair / Check alternator / Replace battery
High charging voltage (overcharging) Faulty electronic voltage regulator / Wiring defect in voltage sensing circuit Replace voltage regulator / Repair wiring

Test yourself

A quick Hyundai Elantra CN7 quiz: every answer comes with an explanation and a link to the manual page.