How to Wire Ignition Switch?

The ignition switch turns on the circuits or signals that start the car. When the vehicle’s electrical system is challenging to turn on, or the starter motor continues to fail to start, it’s time to replace the ignition switch. Therefore, you should know how to wire the ignition switch or starter switch.

The good news is that it’s not a difficult task. This article will assist you in wiring your favourite car ignition switch. Stick with us.

What is Ignition Switch System? Which Wire Powers The Ignition Switch?

An ignition switch is also called a start or starter switch. It is a control system of a motorized vehicle that activates the electrical system and powers the engine. Here, the transponder signal is the key.

However, key switches are the most common ignition switch system on vehicles. Nowadays, keyless or push-button switching is also popular for turning on the ignition system. So, which wire powers the ignition switch? Positive power lead wire. It is the thick red wire.

Note: You can secure the correct terminal end on the power lead wire using a terminal multi-tool.

How Does Ignition Switch Work?

The entire mechanism, including the ignition lock cylinder, is for starting your vehicle’s engine. Also, it powers engine-related accessories. So, how the ignition switching works?

When the ignition switch is pushed by a key or pushed by a button, it sends electricity from the battery to the ignition coil to start the engine. The spark from the coil or coils goes to the spark plugs to start the engine and move the car.

Where Do The Car Ignition Switch Wires Connect?

The ignition wire from the car is connected to the “IGN” terminal on the ignition switch. This terminal is vital for the vehicle’s ignition, wipers, accessories, and other functions. It is also the switch’s “run” position.

Wiring Ignition Switch Step By Step

This part will get how to wire the ignition switch yourself. So let’s jump into the steps. You may need a push-button starter switch. Keep close to your hand.

Step 1: Place the Vehicle In A Parking Lot

Step 2: Find the Ignition Switch Terminals

Find the pins on the back of the ignition switch. Some cars have four terminals: BATT (Battery), ST (Start), IGN (Ignition), and ACC (Accessory). To be cautious, check your car’s repair manual or the manufacturer’s website for confirmation.

Step 3: Unplug the Battery Terminals From the Power Source

Disconnect the negative battery terminal. Your car’s battery has two terminals: positive (+) and negative (-). Loosen the bolt first, then detach the battery terminals. Next, assemble the ignition and secure the negative cable, so it does not touch any of the terminals.

Step 4: Remove Trims from the Steering Wheel

Remove any trim surrounding the steering wheel. You may need to remove the plastic clips, secure them, or remove any nuts or screws. After removing them, store them safely.

Step 5: Dismantle the Steering

Remove the wheel. The ignition switch is either on the dashboard or the steering column. Removing the steering column will make your task much easier. You may need to use a steer wheel puller to make your process easier. Consult your vehicle’s repair manual before doing this step.

Step 6: Unhook the Ignition Module Cover From Its Position

Unhook the ignition module cover hooks. This lets you remove the lid and get to the ignition switch. The clips should have some releases. To release the hooks, you may need a screwdriver.

Step 7: Maintain Proper Key Positioning

Put the key in the ignition and choose “accessory.” A flathead screwdriver is enough if you don’t have your car key.

Note: You will find a small hole to put the screwdriver in and push down on the release pin inside to come out. So, use the screwdriver to press down and move a release pin inside the hole on the ignition module.

Step 8: Free up the Pins

After releasing the ignition switch release pin, it can be pulled out. To get it out, you should have followed all the instructions correctly up until now. To overcome resistance, press the release pin firmly.

Step 9: Observe the Ignition Switch

In order to determine what is wrong with the switch, check first. For doing this, you may use a test light. Then, depending on your requirements, you may need to rebuild the ignition or buy a new ignition switch.

Step 10: Take A Close Look At the Wires

Determine the positive battery power that leads to the ignition switch. It’s usually a thick red wire that’s always on. Once determined, attach the correct terminal end to the power lead to the switch’s “BATT” terminal.

Step 11: Connect the Accessory & Starter Relay Wire

Now, connect the accessory lead wire to the “ACC” terminal on the ignition switch. Turn on the vehicle. When the ignition switch is switched to the “ACC” position, this wire is in charge of supplying power to the car’s accessories and other components.

Next, insert the starting relay wire into the ignition switch’s “ST”. The “ST” terminal only works when the ignition is switched to “START”.

Step 12: Attach the Ignition Wire to Reinstall the Switch

  • Link the ignition wire to the “IGN” terminal.
  • The central terminal controls the car’s ignition, wipers, and accessories.
  • It’s the ignition switch’s default “run” position.
  • Press down the release pin to install the new (or rebuilt) ignition switch in the column.

The cylinder’s shape, the release pin’s position, and the grooves in the ignition module must all match. The ignition switch will click into position as the releasing pin clicks. Keep pressing the ignition switch until you hear the release pin click.

Step 13: Perform an Ignition Test

To test the new ignition switch, you need to make sure the ignition switch is secure. Then-

  • You need to connect the battery again.
  • If the new ignition switch fall, don’t scare to reassemble any parts until you are sure.
  • When you want to reconnect the negative battery terminal, put in the key and try to start the car.

Note: If the ignition is in good shape and you did a good job, the vehicle should turn quickly. If it doesn’t, you might have to start over.

Step 14: Finally, Putting Car Parts Back Together

After ensuring that the ignition switch works appropriately, reassemble the parts. As before, turn off the engine before detaching the battery.

A repair manual may be required to reassemble your vehicle’s components. First, assemble the components using the screws, bolts, and clips instructed in the car repair manual. To wire your ignition switch effectively, follow these procedures up to this point.

Frequently Answered Question:

Q. How many wires go to the ignition switch?

In most autos, there are four terminals; however, this varies. Battery, Start, Ignition, and ACC are designated on these terminals (Accessory). To be cautious, check your car’s repair manual or the manufacturer’s website for confirmation.

Q: Where do ignition switch wires go?

Wire the vehicle’s ignition switch’s “IGN” terminal. This terminal is vital for the vehicle’s ignition, wipers, and other functions. The switch is also in the “run” position.

Q: What colour are the ignition wires?

The ignition wires are red, black, white-red, and white-black.

Q: Is it important ignition switch to be grounded?

Not at all. You don’t have to ground your car’s ignition switch to get it started. However, every terminal in an automobile’s ignition switch should be isolated from the vehicle’s chassis for safety reasons. When the ignition switch’s ground terminals are removed, the rest of the ignition switch is mechanical.

Q: Can the malfunctioning ignition switch cause a problematic start?

Yes. It’s a common difficulty that arises when trying to start a car. It happens when you have a malfunctioning ignition switch. For example, you may have a problem with the ignition switch if your car won’t start after a few tries even though your battery is in good condition.

Q: Can you bypass the ignition switch?

Yes. For that, you need the necessary training and expert knowledge to handle it successfully. However, this technical technique requires more than a handbook and a can-do attitude to complete. If you don’t, go to a mechanic shop.

Wrapping Words

The ignition switch is the core of a vehicle’s electrical system. So, not knowing how to connect an ignition switch can cause problems. If you need to wire your vehicle’s ignition switch, this page has offered a series of procedures. Those are the rules to remember. The universal ignition switch wiring diagram is also recommended.

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