Mercruiser 120 Ignition Wiring Diagram

Mercruiser 120 Ignition Wiring Diagram – We will first take a look at the various kinds of terminals that are found in the ignition switch. They include terminals for the Ignition switch, Coil, and Accessory. Once we know the purpose of each terminal, we are able to identify the parts of the ignition wiring. Then, we will discuss the functions as well as the Coil. Then, we’ll talk about the roles of the Ignition switch and Coil.

Terminals for ignition switch

An ignition switch has three switches. They feed the voltage of the battery to different places. The ON/OFF setting of the ignition switch is controlled by the second switch, which provides power to the choke when it’s pulled. Different manufacturers employ various color codes for the different conductors. This is discussed in a separate article. OMC follows this system. Connectors can be connected to the ignition switch to add the digital tachometer.

Even though some of the ignition switch terminals may not be original, the numbering of each one might not be in line with the diagram. Check the electrical continuity first to ensure that they’re properly connected to the ignition switch. This can be checked using a cheap multimeter. After you’re satisfied with the integrity of the wires you can connect the new connector. If your car is equipped with an original factory-supplied ignition switch (or wiring loom) the wiring loom may differ from that of the car.

It is important to know the differences between the ACC and auxiliary outputs. The ACC and IGN terminals are the default connections on your ignition switch. the START and IGN terminals are the primary connections for radio and stereo. The ignition switch acts as the engine’s off/on button. On older vehicles the terminals of the ignition switch are marked with the alphabets “ACC” as well as “ST” (for individual magnet wires).

Terminals for coil

Understanding the terminology utilized is the initial step in finding out the right kind of ignition coil to choose. A basic diagram of the wiring will show you a number of terminals and connections. The coils have a specific operating voltage. The first method of determining what type you’ve got is to check the voltage of S1 the main terminal. S1 must be tested for resistance in order to identify if the coil belongs to type A, B or C.

The chassis’ negative end should be connected to to the coil’s lower-tension end. This is what is known as the ground for the wiring for ignition. The high-tension side supplies positively directly to the spark plugs. It is necessary for suppression purposes that the body of the coil’s metal be connected to the chassis, however, it is not necessary. You will also see the connections between the positive and the negative coil’s terminals on an ignition wiring diagram. In some cases it is possible to find a malfunctioned ignition coil can be diagnosed with scanning at an auto parts store.

The black-and-white-striped wire from the harness goes to the negative terminal. The white wire is the other one. It is black with a trace, and connects to the positive terminal. The black wire connects to the contact breaker. It is possible to check the connections using a paperclip to remove the wires from the housing. Be sure that you don’t bend the connectors.

Accessory terminals

The diagrams for ignition wiring depict the wires that are used in the vehicle’s power supply. There are generally four terminals with color codes that are connected to each component. The red symbol represents accessories, yellow for the battery, and green for the solenoid for starters. The “IGN” terminal lets you start the car, manage the wipers, or any other functions. The diagram illustrates the connection between the ACC- and ST terminals.

The terminal BAT connects the battery to the charger. The battery is essential for the electrical system to start. Additionally, the switch will not be able to turn on without the battery. To find your car’s battery, check your wiring diagram. The ignition switch is connected to the battery of your car. The BAT connector is connected to your battery.

Certain ignition switches have an accessory position where users can alter their outputs and manage them without the need to use the ignition. Some customers want an auxiliary output that can be used independently from the ignition. You can use the additional output by connecting the connector to the ACC terminal on your switch that has the same color. While this is a convenient feature, there is one significant difference. Some ignition switches are configured to be in an ACC position once the car is in the ACC position. They’ll also be in START mode after the vehicle has been moved into the IGN position.