Why Do Electrical Features Like Power Windows, Sensors, and the Alternator Give Trouble in Hyundai Santro?

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Why Do Electrical Features Like Power Windows, Sensors, and the Alternator Give Trouble in Hyundai Santro?

Electrical issues such as malfunctioning power windows, weak alternators, dead sensors MAP, O2, and wiring problems are common in Santros. What are the key weaknesses in the Santro’s electrical system design, and how can owners maintain these features to prevent frequent failures?

Talha Kyanii asked on 03 Dec 2025 14:33:09 pm

1 Answer

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Gari Master - on 03 Dec 2025 14:39:43 pm

Electrical issues are common in Santro, especially in cars that are now 15–20 years old.

Reasons for Electrical Failures

Weak Alternator over Time:
The alternator often becomes weak, leading to dim lights, poor battery charging, and failing sensors.

Aging Wiring Harness:
Heat and age cause wiring insulation to crack, resulting in short circuits o r dead electrical components.

Power Window Motor Wear:
The window motors get weak o r stuck due to dirt, old grease, o r worn brushes.

Sensor Sensitivity:
The Santro relies heavily on the MAP sensor, TPS, and O2 sensor, all of which can fail due to dust, vibration, and heat.

Poor Grounding:
Weak grounding points cause irregular sensor readings and ECU errors.

How to Keep the Electrical System Stable

Check alternator output regularly.

Clean/replace grounding wires and battery terminals.

Service power windows to keep them smooth.

Replace weak sensors instead of bypassing them.

Keep wiring protected from heat and moisture.