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Tell why both front light of Yamaha fazer swiched on at the same time or its a manufacturing defect in my bike?

Both front lights of the Yamaha Fazer should not switch on at the same time. It is usually designed so that the low-beam headlight is on by default, and the high-beam headlight is activated when you switch to the high-beam setting.

Here are a few possible reasons why both headlights might be coming on simultaneously:

1. Incorrect Wiring:

There might be an issue with the electrical wiring of the bike. The wiring might be incorrectly connected, causing both headlights to receive power simultaneously. This could be a manufacturing defect or an issue during the installation or modification of the bike's electrical system.

2. Faulty Switch:

The headlight switch might be malfunctioning. When you switch to the high-beam setting, it could be sending power to both the low-beam and high-beam headlights instead of just the high-beam. A faulty switch could be the result of a manufacturing defect, wear and tear, or damage due to external factors.

3. Electrical Short Circuit:

There might be a short circuit in the electrical system that is causing the headlights to turn on together. A short circuit occurs when two wires carrying electrical current come into contact with each other unexpectedly, creating an unintended flow of electricity.

4. Accessory Installation:

If you have installed any aftermarket accessories that involve electrical connections, such as additional lighting or other electrical devices, the wiring for those accessories might be interfering with the headlight circuit and causing both headlights to turn on at the same time.

To determine the exact cause of this issue, it is best to have your bike inspected by a qualified mechanic or an authorized Yamaha dealer. They can diagnose the problem accurately and perform any necessary repairs or replacements.