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What causes car to stall when you turn on lights?

A car stalling when the lights are turned on can be caused by several factors:

1. Faulty alternator: The alternator is responsible for generating electrical power for the vehicle's electrical system, including the lights. If the alternator is not functioning properly or is unable to generate enough power, it can cause the electrical system to become overloaded and drain the battery, leading to stalling.

2. Weak battery: A weak or failing battery may not have enough power to support the additional load of the headlights, causing the voltage to drop and the engine to stall. A faulty battery may also have difficulty holding a charge, which can exacerbate the problem.

3. Poor electrical connections: Loose or corroded electrical connections can impede the flow of electricity, causing problems with the lighting system and potentially leading to stalling. This issue can affect the battery terminals, alternator connections, or any other points where electrical components are connected.

4. Overloaded electrical system: If the electrical system is overloaded with too many accessories or devices drawing power, it can exceed the capacity of the alternator and battery, leading to voltage drops and potential stalling.

5. Grounding issues: Inadequate or compromised grounding can affect the proper functioning of electrical components, including the lighting system. Poor grounding can cause voltage irregularities and electrical imbalances, leading to stalling.

It's important to note that not all stalling issues when turning on the lights are related to the aforementioned factors. If you experience this problem, it's best to have your vehicle inspected by a qualified mechanic or automotive electrician to accurately diagnose the root cause and ensure safe operation of your vehicle.