How to wire an ignition switch?


Quick Answer

Wiring an ignition switch involves locating the ignition switch, identifying the pins, disconnecting the negative battery cable, connecting the lead wire to the ACC terminal, connecting the relay wire to the ST terminal, connecting the ignition wire to the IGN terminal and reconnecting the negative battery cable. Disconnecting the cable exposes the terminals and enables the power lead wires to be connected to the terminal of the switch.

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Full Answer

The back of the ignition switch has four terminals, which are the Battery, Start, Ignition and Accessory. The procedure for wiring an ignition switch is as follows:

Step 1: Disconnect the negative battery terminal
To begin with, the negative battery terminal must be disconnected before locating the positive power lead to the switch. This is followed by installing the right terminal end on the power lead wire and connecting it to the battery terminal.

Step 2: Connect the accessory lead wire
The next step involves connecting the accessory lead wire to the accessory terminal using the right wire terminal. The accessory lead wire energizes other vehicle accessories, such as the radio, when the ignition is turned to the ACC position.

Step 3: Connect the starter relay wire
The starter relay wire needs to be connected to the Start terminal located on the ignition switch.

Step 4: Connect the ignition wire
The final step is connecting the ignition wire to the ignition terminal located on the ignition switch. The IGN terminal powers vehicle ignition, wipers, accessories and other operating features. The cable must be reconnected to the negative battery terminal.

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