Starter Solenoid Wiring Diagram: 3 Pole Starter & What Wires Go To Starter | The Easy Way |

Starter Solenoid Wiring Diagram

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A starter solenoid is an electromagnetic switch that connects and disconnects the battery to the starter motor assembly. It is a huge switch, which works as a bigger relay to turn ON and OFF the starter motor assembly.

The starter solenoid works on the principle of electromagnetism. It has three terminals on the back of the solenoid cap.

If you want to know the starter solenoid wiring diagram in simple words. This page explains very easily. On this powerful page, you will learn the starter solenoid wiring, especially the 3 pole starter solenoid wiring diagram in understandable language, so that you know what wires go to the starter solenoid.

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The Starter (Engine)

Starter Solenoid and Motor Assembly
Starter Solenoid and Motor Assembly

Many people get confused between the starter motor and the starter solenoid. A starter consists of two components, a starter motor assembly, and a solenoid. A starter motor assembly is the bigger cylindrical components used to crank the engine.

While a starter solenoid is a small cylindrical component, placed on the top of the starter motor assembly, which makes and breaks the connection between the starter motor assembly and the battery.


Starter Solenoid Wiring Diagram

Starter Solenoid Wiring
Starter Solenoid Wiring

The starter solenoid wiring diagram is very easy, don’t worry. I am here to explain it quickly. A starter solenoid has three terminals, one small pin-type terminal, and two thicker bolt-type terminals.

Car Starter Motor Control Circuit Diagram
Car Starter Motor Control Circuit Diagram

The small pin-type terminal is called the “S” terminal. The “S” terminal links with the ignition switch circuit. This circuit is called the starter solenoid control wire, which links from the ignition wire to the starter solenoid. The ignition switch sends the current to the starter solenoid through the fuse, then to the neutral safety switch, then to the starter relay, and finally to the starter solenoid.

The starter solenoid’s one thicker terminal is the input terminal means the battery positive power source enters the solenoid through this terminal, and the second thicker terminal is the output terminal, which goes to the starter motor assembly.

When you turn the ignition switch key, the current starts to flow from the ignition switch to the starter fuse, then to the neutral safety or clutch pedal safety switch, then to the starter relay in the fusebox, and finally to the starter solenoid “S” terminal. The camshaft sensor provides DATA to the ECM or PCM. The ECM or PCM decides to send the signal to the starter relay to activate it.

When the starter relay is activated, it sends the current to the solenoid pin-type “S” terminal. When the “S” terminal receives the current, it pulls the plunger inside the solenoid making the connection between the two thicker terminals, and the current starts to flow directly from the battery to the starter motor assembly.


3 Pole Starter Solenoid Wiring Diagram

Starter Solenoid Terminals
Starter Solenoid Terminals

A 3 pole starter solenoid is usually also called a 3 terminal starter solenoid. It is the same starter solenoid we have discussed above. A 3 pole starter solenoid has three terminals at the back of the solenoid cap, one small terminal, and two thicker terminals.

The small terminal is called the “S” terminal, which stands for signal means the ignition switch signals the starter solenoid for activation through this terminal.

The other two terminals are thicker and larger in size, in which one terminal is a feed terminal and is connected to the battery positive power source. The second thicker terminal is the output terminal and is connected to the starter motor assembly.


What Wires Go To The Starter Solenoid

Diagram What Wires Go To The Starter Solenoid
Diagram What Wires Go To The Starter Solenoid

The starter solenoid wiring diagram is no more a mystery. It is very easy. If you don’t know what wires go to the starter solenoid. Here is a quick illustration.

  1. The Pin-types “S” terminal goes to Ignition Switch.
  2. The Bolt-type Feed Terminal goes to the battery positive power source.
  3. The Bolt-type Output Terminal goes to the starter motor assembly.

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