When it comes to the ignition system of your Mercury outboard motor, the ignition switch plays a critical role. It is responsible for turning the engine on and off, as well as for managing the power supply to the various components of the system. In this article, we will discuss the wiring diagram for a 6-wire ignition switch commonly found on Mercury outboard motors.
Wiring Diagram
The wiring diagram for a 6-wire ignition switch is relatively simple. The switch has six terminals, which are labeled as follows:
| Terminal Label | Wire Color |
|---|---|
| Battery | Red or Red/Black |
| Ignition | Yellow or Yellow/Red |
| Accessory | Purple or Purple/White |
| Start | Black or Black/Yellow |
| Choke | Tan or Tan/Blue |
| Ground | Black or Black/Yellow |
When wiring the ignition switch, it is important to connect the wires to the correct terminals to ensure proper functioning of the ignition system. Below is a detailed discussion of each of the six terminals:
Battery
The battery terminal is typically connected to the positive terminal of the battery. This wire supplies power to the ignition switch and to the other components of the system that require a constant source of power, such as the fuel gauge and the hour meter.
Ignition
The ignition terminal is typically connected to the ignition coil or distributor. This wire supplies power to the spark plugs and is responsible for igniting the fuel in the combustion chamber. When the ignition switch is turned to the “on” position, this wire becomes hot.
Accessory
The accessory terminal is typically connected to the fuse block or an accessory panel. This wire supplies power to any accessories that are connected to the system, such as the radio or GPS.
Start
The start terminal is typically connected to the starter solenoid. This wire supplies power to the starter motor, which cranks the engine when the ignition switch is turned to the “start” position.
Choke
The choke terminal is typically connected to the choke solenoid. This wire supplies power to the choke plate, which restricts the air flow to the carburetor and enriches the fuel mixture during cold starts.
Ground
The ground terminal is typically connected to the negative terminal of the battery or to a common ground point in the system. This wire provides a path for the current to flow back to the battery, completing the circuit.
FAQ
What happens if I connect the wires to the wrong terminals?
If you connect the wires to the wrong terminals, several things can happen. The engine may not start, or it may run poorly. The accessories may not function properly, or they may not function at all. In some cases, connecting the wires to the wrong terminals can cause damage to the ignition system or other components of the motor.
How can I tell which wire goes to which terminal?
The best way to determine which wire goes to which terminal is to consult the wiring diagram that came with your Mercury outboard motor. If you do not have the wiring diagram, you can usually find it online or by contacting the manufacturer.
Can I use a 6-wire ignition switch on a different brand of outboard motor?
While it is possible to use a 6-wire ignition switch on a different brand of outboard motor, it is not recommended. Each brand of outboard motor has its own unique ignition system, and using a switch that is not specifically designed for your motor can result in poor performance or damage to the system.
How often should I check my ignition system for proper functioning?
It is recommended that you check your ignition system at least once a year or before each boating season. This includes checking the wiring, connections, and terminals for signs of wear or damage. You should also test the system to ensure that it is functioning properly before heading out on the water.
What should I do if my ignition system fails?
If your ignition system fails, you should immediately stop the engine and troubleshoot the problem. This may involve checking the wiring and connections, testing the components of the system, or consulting a professional mechanic or electrician.
In summary, the wiring diagram for a 6-wire ignition switch on a Mercury outboard motor is a critical component of the ignition system. By understanding the function of each of the six terminals and properly wiring the switch, you can ensure that your ignition system operates smoothly and reliably. If you have any questions or concerns about your ignition system, be sure to consult the manufacturer or a professional mechanic for assistance.
