How To Wire Ignition Switch

By Max Anthony •  Updated: 08/11/22 •  5 min read

Driving a car is a skill that takes time and practice to perfect. However, one of the most important aspects of driving is knowing how to start the car.

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A car ignition switch is a small, but important, part of your car. It controls the flow of electricity to your car’s engine. If your ignition switch is not working correctly, your car may not start. This can be a problem if you need your car to start in order to get to work or if you need it to get you home from a night out.

The ignition switch can be a source of problems for a number of reasons. If it is not working properly, the switch can become dirty or corroded. This can cause the switch to stick or fail to work properly. In addition, if the switch is damaged, water may get inside the switch and cause it to short out. This can cause your car to not start at all.

If you are experiencing problems with your car’s ignition switch, it is important to take action. You can have your car checked by a mechanic or you can try to fix the problem yourself. Keep in mind that if you try to fix the switch yourself, you may need to replace it. Therefore, it is important to know all you need to about the ignition switch in order to repair or replace it correctly.

How To Wire Ignition Switch

Here are some steps to wire your ignition switch:

Park Your Car

First, you need to park your car so that you can work on the wiring. If your car is in motion, the electrical current in the wires will be interrupted and it will be difficult to work on the wiring. Turn off the car’s engine and wait until it has completely stopped before you begin working on the wiring.

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Ascertain the Terminals on the Ignition Switch

Find out where the pins are located in the ignition switch. There are four terminals that are marked as BATT (Battery), ST (Start), IGN (Ignition), and ACC (Accessory). To be safe, get some confirmation from the manuals.

Disconnect the Positive and Negative Battery Cables

Firstly, you’ll need to disconnect the negative battery cable from the battery by disconnecting it from the negative terminal on the battery. There are two terminals that are connected to your vehicle’s battery that are marked positive (+) and negative (-) respectively.  You will need a wrench to unlatch the bolt that holds the battery together by removing the protective cover. You should make sure that you secure the negative cable very securely so that it does not come into contact with any of the terminals that you will be using to wire the ignition.

How To Wire Ignition Switch

Remove Steering Wheel Trims

Next, you will need to remove the plastic that surrounds the steering wheel. Luckily, it is easy to get access to the wires that run underneath the trim. You’ll also need to get rid of any sensors that are located under the steering wheel.

Remove the Steering Wheel

Remove the steering wheel to access the wiring for the ignition switch. Some vehicles have their ignition switch located in the center of the dashboard, while other vehicles have it located along the side of the steering wheel. If your car has a display in the center of the dashboard, you should be able to locate the switch there. Accessing the switch to turn on the ignition will require you to remove the steering column. You will need to use a steering wheel nut driver to help you do this step. Check to see if there are any wiring diagrams for ignition switches that you can use.

Free Up the Ignition Module Cover

Unlock the hooks that hold the cover on the ignition switch. This will allow you to remove the cover on the ignition module and access the switch. There should be some mechanisms that allow you to release the locking clips in order to access the ignition switch. You will need a screwdriver to be able to press down on the release mechanism that is installed on the hooks in order to open them.

Take a Look at the Ignition Switch and the Wires

Next, take a look at the ignition switch and the wires that it connects to. You will need to remove the switch from the car in order to do this. Check to see if the wires are still connected to the switch. If they are not, you will need to connect them.

Connect the Accessory Wire to the Ignition Switch

Next, connect the accessory wire to the ignition switch. This wire is usually red and connects to the battery. If your car has a manual transmission, you will also need to connect the neutral wire to the ignition switch.

Connect Starter Relay Wire

Next, connect the starter relay wire to the ignition switch. This wire is usually green and connects to the car’s engine.

Reinstall the Ignition Switch

Finally, reinstall the ignition switch in the car. Make sure that the wires are connected correctly and that the switch is securely in place.

If you are having trouble starting your car, the first thing you should do is check the wiring in your car. If the wiring is damaged, this can cause the switch to not work. In addition, if there is water inside the switch, it can short out the electrical current. If you are not sure if the wiring in your car is damaged, you can check for water inside the switch by using a voltmeter. You can also use a scan tool to test the switch.

If you are not sure if the wiring in your car is damaged, you can check for water inside the switch by using a voltmeter. You can also use a scan tool to test the switch. If the scan tool shows that the switch is not working, you may need to replace the switch.

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Max Anthony

Max is a gizmo-savvy guy, who has a tendency to get pulled into the nitty gritty details of technology and cars. He attended UT Austin, where he studied Information Science. He’s married and has three kids, one dog and a GMC truck and a Porsche 911. With a large family, he still finds time to share tips and tricks on cars, trucks and more.

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