Starter and alternator problems

Battery, starter or alternator?

A slow crank can indicate low battery voltage or resistance in a connection. A single click may relate to the starter circuit. A battery that goes flat while driving may involve charging-system trouble. These patterns guide testing but are not proof on their own.

Charging-system warning signs

• Battery warning light while driving
• Headlights changing brightness
• Repeated flat battery after replacement
• Electrical systems behaving erratically
• Burning smell or unusual belt noise

Diagnosis before replacement

Testing battery condition, cranking voltage, charging output and major connections helps reduce unnecessary parts replacement. Intermittent faults may require further observation or workshop diagnosis.