- Battery faulty (e.g., plates sulphated, shorted through sedimentation, electrolyte insufficient)
- Battery leads making poor contact
- Load excessive (e.g., bulb of excessive wattage)
- Ignition switch trouble
- Alternator trouble
- Wiring faulty
- Regulator/rectifier trouble
Battery overcharged:
- Regulator/rectifier trouble
- Battery faulty