- Faulty Blower Motor Resistor: The blower motor resistor is responsible for controlling the fan speed of the blower motor. If it fails, it can disrupt the electrical circuit and affect the functioning of the headlights.
- Electrical Short: There may be an electrical short in the wiring between the blower motor and the headlights. When the blower motor is turned on, the short causes a power drain, resulting in the headlights turning off.
- Faulty Headlight Switch: If the headlight switch is malfunctioning, it may not properly engage the electrical circuit when the knob is turned to the on position. This could lead to the headlights not receiving power when the switch is turned on, especially if the blower motor is also turned on at the same time.
- Grounding Issue: A poor grounding connection for either the blower motor or the headlights can result in erratic electrical behavior. If either of these components is not properly grounded, the electrical circuit may be affected, causing the headlights to turn off when the blower motor is turned on.
- Faulty Ignition Switch: In some cases, a faulty ignition switch can lead to electrical issues in the vehicle, including the malfunctioning of the headlights and blower motor.
To resolve this issue, it's recommended to consult with a qualified mechanic who can accurately diagnose and address the underlying problem.
