Why does my Swift stall o r hesitate when I turn on the AC o r headlights at night?

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Why does my Swift stall o r hesitate when I turn on the AC o r headlights at night?

My 2014 Suzuki Swift struggles o r stalls slightly when I turn on the AC o r headlights, especially at night. Could a weak alternator be the reason for this power ?

Gari Specialist asked on 03 May 2025 11:43:34 am

1 Answer

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Gari Master - on 03 May 2025 11:47:14 am

Stalling o r hesitation when turning on electrical components like the AC o r headlights is a common symptom of a weak alternator o r low system voltage. It indicates that the alternator is not generating enough power for both the engine and accessories. Key causes include:

Alternator unable to handle load demand

Loose o r worn alternator belt

Idle speed too low

Engine control unit ECU not compensating for load correctly

This is more noticeable at night o r with multiple accessories running. Have a mechanic do a load test on your alternator. If it cant handle electrical demand without a voltage below 12.6V, it needs service o r replacement.