When it comes to automotive lighting, the 1157 bulb is one of the most popular and commonly used bulbs. It is versatile, efficient, and cost-effective. However, understanding the 1157 wiring diagram can be a bit tricky. In this article, we will delve into this topic in detail and provide you with all the information you need to know.
What is an 1157 Bulb?
The 1157 bulb is a dual-function bulb widely used in cars, trucks, and other vehicles. It has two filaments, a low filament, and a high filament. The low filament is usually used for parking lights and other marker lights, while the high filament is used for turn signals, brake lights, and other high-intensity lighting functions.
The 1157 bulb is also known as a BAY15d bulb, which stands for its base type. The “B” refers to the bayonet mount, while the “15” represents the diameter (in millimeters) of the base. The “d” indicates that it has a double-contact base.
Understanding the 1157 Wiring Diagram
Before we delve into the 1157 wiring diagram, it’s essential to understand some basic terms and concepts.
Terminals
The 1157 bulb has two terminals – one for each filament. The high filament terminal is the one closest to the bulb’s base, while the low filament terminal is the one farthest from the base. These terminals are usually identified by their color. The high filament terminal is typically red, while the low filament terminal is usually black or green.
Polarity
Another critical concept to understand when it comes to wiring the 1157 bulb is polarity. Polarity refers to the positive and negative charges in a circuit. The 1157 bulb is a polarized bulb, which means it has a specific orientation that must be followed when wiring it. The high filament terminal is the positive terminal, while the low filament terminal is the negative terminal.
1157 Wiring Diagram
The 1157 wiring diagram is relatively simple. To wire the 1157 bulb correctly, you need to connect the positive wire to the high filament terminal and the negative wire to the low filament terminal. When you apply power to the bulb, the low filament will light up first, while the high filament will only light up when you apply the brakes or turn on the turn signal.
FAQ
What other bulbs are similar to the 1157 bulb?
The 1157 bulb is similar to the 2357, 7528, and 2057 bulbs. All these bulbs have a dual-filament design, and they can be used for brake lights, turn signals, and other high-intensity lighting functions.
Can I use an 1156 bulb instead of an 1157 bulb?
No, you cannot use an 1156 bulb instead of an 1157 bulb. The 1156 bulb only has one filament, and it is not suitable for high-intensity lighting functions like brake lights and turn signals.
What is the difference between a BAY15d and a BA15d bulb?
The BAY15d and BA15d bulbs are both dual-contact bulbs used in cars and trucks. The primary difference between the two is the configuration of their bases. The BAY15d bulb has a bayonet mount, while the BA15d bulb has a push-in base.
Conclusion
Understanding the 1157 wiring diagram is essential if you want to properly wire your vehicle’s lighting system. Remember to follow the correct polarity and connect the positive wire to the high filament terminal and the negative wire to the low filament terminal. If you have any questions or concerns, consult a professional automotive electrician.
| Terminals | Color |
|---|---|
| High Filament | Red |
| Low Filament | Black or Green |
