![]() Fit the terminal end from the power lead wire and secure it. It’s often a red wire that’s thick and constantly energized. ![]() Start with the positive lead from the car battery going to the ignition switch. With this step, it’s important to follow all of the guidelines in the service manual for your vehicle, so nothing else gets ruined. You can use a steering wheel puller to make it a little easier. Taking the steering wheel off will also make the task easier in many cases. Make sure you place any bolts, clips or screws in a safe location for reassembly. There could be plastic clips securing the trim in place. If there’s trim around the steering wheel, you need to remove it now. However, modern cars can have many more connections to the ignition switch. They should be marked BATT (Battery), ACC (Accessory), ST (Start) and IGN (Ignition). With most cars, you’ll find four terminals total. Otherwise, search out a diagram for your vehicle online. You can get this information from your car’s repair manual. Identify Ignition Switch Terminalsīefore you go any further, it’s best to figure out what switch terminals you are working with. Prevent it from contacting the positive terminal while it is disconnected. Remove the negative connection from the battery. As you look at the battery, you will see the positive and negative sides. Disconnect Batteryīefore you move forward on any further work, it’s best to disconnect the battery. The engine should be turned off as you perform the following steps. Otherwise, you are going to be running around getting parts and tools while you are in the middle of the job.Īdditionally, you want to park the vehicle on level ground with the emergency brake engaged. It’s important to gather all of your tools and equipment in advance. Prepare Vehicleīefore you start any at-home job on your vehicle, you should prepare everything ahead of time. But here’s how older ignition switches are wired and how you can wire your own ignition switch into a vehicle.Īlways check a wiring diagram for your vehicle beforehand to ensure that you will not damage any electrical parts. Modern car models can also have many different wires going to the switch, such as the immobilizer etc. The wiring for an ignition switch is very different depending on the type of vehicle you have. By the end of this guide, you should be an ignition switch wiring expert. ![]() I also look at whether or not the ignition switch needs to be grounded. In this guide, I outline the steps to wire the ignition switch and describe what wires are included. ![]() This job isn’t as easy as it might sound, but with some mechanical experience, you can learn how to wire an ignition switch. If you are looking at replacing or repairing an ignition switch, it helps to know more about the wiring. ![]()
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