How to Wire Ignition Switch and What Wires Go to Ignition Switch

How to Wire Ignition Switch and What Wires Go to Ignition Switch

The ignition switch is a vital component of a vehicle’s electrical system, responsible for connecting and disconnecting the battery’s power to the starter, as well as controlling various functions such as the lights, radio, and accessories. In order to properly wire an ignition switch, it is important to understand the function of each wire and where it connects. In this article, we will discuss the basics of how to wire an ignition switch and the specific wires that go to the switch. By the end of this article, you will have a good understanding of this essential process and be able to wire an ignition switch with confidence.

What wires go to the ignition switch

What wires go to the ignition switch

The ignition switch plays a crucial role in starting and turning off a vehicle’s engine. It is a simple, but vital component of the overall ignition system. The ignition switch is generally located on the steering column or dashboard, and is easily accessible to the driver. When the key is turned in the switch, it completes a circuit that allows the vehicle’s starter to engage and start the engine.

Without proper wiring, the ignition switch cannot function correctly, and the vehicle will not start. So, what wires go to the ignition switch? Let’s take a closer look.

1. Battery Power

The first wire that connects to the ignition switch is the battery power wire, also known as the “hot” wire. This wire is usually red and is connected directly to the battery’s positive terminal. It provides the necessary power to operate the ignition switch and the entire electrical system of the vehicle.

2. Ignition Coil Wire

The second wire that connects to the ignition switch is the ignition coil wire. This wire is responsible for supplying power to the ignition coil, which generates the high voltage needed to create a spark in the spark plugs. This spark is what ignites the fuel and air mixture in the engine, which starts the combustion process.

3. Start Wire

The start wire is crucial for turning on the starter motor when the key is turned in the ignition switch to start the engine. This wire is typically connected to the starter solenoid, which is responsible for engaging the starter motor when the key is turned. It is usually a thicker wire and is commonly colored purple.

4. Ignition Switch Output

The ignition switch output wire is vital for supplying power to the vehicle’s electrical components, such as the radio, lights, and instrument cluster. It is also responsible for sending power to the fuel pump, which is needed to pump fuel from the gas tank into the engine. This wire is usually connected to the fuse box or the vehicle’s main electrical harness.

5. Accessory Wire

The accessory wire provides power to electrical accessories, such as the radio, air conditioning system, and windshield wipers. This wire is only activated when the key is turned to the “ACC” or accessory position. It allows the driver to use these electrical components without turning on the engine.

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6. Ground Wire

The final wire that connects to the ignition switch is the ground wire. This wire is typically connected to the vehicle’s chassis or a dedicated grounding point. Its purpose is to complete the electrical circuits and provide a path for the electrical current to return to the battery.

In conclusion, the ignition switch is a critical component of a vehicle’s ignition system, and it requires several wires to function correctly. These wires provide power to essential components, such as the starter motor, ignition coil, and fuel pump, allowing the engine to start and run smoothly. Without these wires, the ignition switch would be unable to send the necessary power to these components, rendering the vehicle inoperable.

How to wire ignition switch step by step

How to wire ignition switch step by step

Wiring an ignition switch is a relatively simple process that can be completed by following a few steps. The ignition switch is responsible for controlling the power to different systems in your vehicle, such as the engine, starter motor, and accessories like the radio and dashboard lights. Here’s a step-by-step guide on how to wire an ignition switch:

Step 1: Gather Materials
To begin with, you will need a few tools and supplies to wire your ignition switch. This includes a 12-volt test light, wire strippers, electrical tape, a soldering iron, and a crimping tool. You will also need a wiring diagram for your specific vehicle to ensure proper connections.

Step 2: Disconnect the Battery
Before starting any electrical work on your vehicle, always disconnect the battery to avoid any potential electric shocks. Locate the negative (-) terminal of the battery and loosen the nut on the cable clamp to disconnect it.

Step 3: Locate the Ignition Switch
The ignition switch is usually located on the steering column near the dashboard. Once you have located it, remove any panels or covers that may be blocking the switch.

Step 4: Remove the Old Ignition Switch
Using a screwdriver or a wrench, remove the screws or bolts holding the old ignition switch in place. Once the old switch is removed, place it aside.

Step 5: Identify the Wires
Using the wiring diagram for your vehicle, identify the wires that need to be connected to the ignition switch. These wires will typically include the accessory wire, starter wire, and ignition wire.

Step 6: Connect the Starter Wire
Using a crimping tool, strip about half an inch of insulation from the starter wire, then connect it to the “S” or “ST” terminal on the new ignition switch using a crimp connector. Make sure the connection is secure.

Step 7: Connect the Ignition Wire
Strip about half an inch of insulation from the ignition wire and connect it to the “IGN” or “IG” terminal on the ignition switch using a crimp connector. Again, ensure the connection is secure.

Step 8: Connect the Accessory Wire
Using a crimping tool, strip about half an inch of insulation from the accessory wire, then connect it to the “ACC” or “A” terminal on the ignition switch using a crimp connector.

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Step 9: Test the Connections
Before securing the ignition switch in place, test the connections using the 12-volt test light. Connect the alligator clip from the test light to a good ground, then touch the probe of the test light to each of the terminals on the ignition switch. The light should illuminate when the key is turned in the various positions (ACC, ON, START).

Step 10: Secure the Ignition Switch
Once all the connections have been tested and are working correctly, secure the new ignition switch in place using screws or bolts.

Step 11: Reconnect the Battery
Once the ignition switch is securely in place, reconnect the negative (-) cable to the battery terminal and tighten the nut.

Step 12: Test the Ignition Switch
Reconnect the battery and test the ignition switch to ensure everything is working as it should. Your engine should start without any issues, and the various accessories should also work.

Congratulations! You have successfully wired your ignition switch. Remember to always refer to the wiring diagram and test all connections before using your vehicle.

How to find an affordable car Mechanic

How to find an affordable car Mechanic

As a mechanical engineer, I understand the importance of having a reliable and affordable car mechanic. A good mechanic can save you both time and money by providing quality maintenance and repair services for your vehicle. However, finding such a mechanic can be a daunting task, especially with the plethora of options available in the market. In this article, I will discuss some tips on how to find an affordable car mechanic.

1. Ask for recommendations: One of the best ways to find an affordable car mechanic is to ask for recommendations from friends, family, and colleagues. They may have had previous experiences with a mechanic and can provide valuable insights on their affordability and quality of service. Additionally, you can also check online reviews and ratings of local mechanics to get an idea of their service quality and pricing.

2. Compare prices: Before settling for a mechanic, it is essential to compare prices from different service providers. This will give you an idea of the average cost for specific services, and you can avoid being overcharged. However, prices should not be the only factor to consider when choosing a mechanic. The quality and reputation of the mechanic should also be taken into account.

3. Look for certification: A certified mechanic has undergone specialized training and is more likely to provide quality services at a reasonable price. In addition, they have a better understanding of different car models and their maintenance requirements, which can save you time and money.

4. Avoid dealership services: Dealerships are known for charging higher prices for car maintenance and repairs. You can save a significant amount by opting for an independent mechanic or a smaller repair shop. These establishments are likely to offer competitive rates to attract more customers.

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5. Inquire about warranties: Some mechanics offer warranties for their services, which can be beneficial if something goes wrong with your vehicle shortly after a repair. It is essential to check the terms and conditions of the warranty before committing to a mechanic.

6. Consider location: Choosing a mechanic located in a fancy neighborhood may result in higher service fees. Consider opting for a mechanic in a more affordable area to save on costs. Additionally, you can also look for mobile mechanics who can come to your location, which can save you both time and money.

7. Maintain regular car maintenance: Regularly maintaining your car can prevent major issues and expensive repairs. Some mechanics offer discounted rates for regular customers, so it is worth establishing a long-term relationship with a mechanic you trust.

In conclusion, finding an affordable car mechanic requires some effort and research. By asking for recommendations, comparing prices, considering certification, avoiding dealerships, inquiring about warranties, choosing a convenient location, and maintaining regular car maintenance, you can find an affordable mechanic that provides quality services. Remember, it is not always about finding the cheapest option, but rather finding a mechanic who offers a balance of affordability and quality.


In summary, understanding how to wire an ignition switch is crucial in ensuring the proper functioning of your vehicle’s electrical system. By following the steps outlined in this article and identifying the correct wires that connect to the ignition switch, you can easily replace a faulty switch or install a new one. Remember to always refer to the vehicle’s manual and use caution when working with electrical connections. With the right knowledge and tools, you can confidently wire an ignition switch and have your vehicle up and running in no time.

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