The Fisher 4 Port Isolation Module is essential for connecting snow plow systems to vehicles, ensuring proper electrical functionality. This guide provides a detailed overview of the wiring diagram and installation process, targeting vehicle owners and technicians seeking to install or troubleshoot their snow plow systems.

Overview of the Fisher 4 Port Isolation Module

The 4 Port Isolation Module serves as an electrical hub that directs power between the vehicle and the snow plow's lighting system. It allows for seamless operation of vehicle lights and snow plow controls, ensuring that signals are correctly routed to the appropriate devices.

Key Features

  • Ports: The module has four ports:

- Port 1: Vehicle control harness

- Port 2: Vehicle lighting harness

- Port 3: Driver-side plug-in harness

- Port 4: Passenger-side plug-in harness

  • Functionality: The isolation module automatically switches power between the vehicle's lighting system and the snow plow's lighting, depending on whether the plow is attached.

Wiring Diagram Components

To successfully wire the Fisher 4 Port Isolation Module, follow these steps:

1. Preparation:

- Ensure all components are present.

- Disconnect the vehicle battery to avoid electrical shorts.

2. Harness Connections:

- Connect the vehicle control harness to Port 1.

- Connect the vehicle lighting harness to Port 2.

- Attach the driver-side plug-in harness to Port 3.

- Attach the passenger-side plug-in harness to Port 4.

3. Power Connections:

- Connect the red wire from the vehicle battery cable to a large terminal on the motor relay.

- Route the black wire from the battery cable to the negative terminal or frame ground.

Important Wiring Notes

  • Use dielectric grease on all connections to prevent corrosion.
  • Ensure connections are tight but avoid overtightening, which can cause seal failure.

Installation Steps

1. Mount the isolation module securely within the engine compartment, choosing a flat surface away from heat sources.

2. Route all harnesses neatly, avoiding sharp edges and moving parts.

3. Make sure all connections are secure before reconnecting the vehicle battery.

StepDescription
1Disconnect vehicle battery.
2Connect control harness to Port 1.
3Connect lighting harness to Port 2.
4Connect driver-side plug-in harness to Port 3.
5Connect passenger-side plug-in harness to Port 4.
6Secure all connections with dielectric grease.
7Reconnect vehicle battery and test system.

FAQs About Fisher 4 Port Isolation Module

    • What is a Fisher 4 Port Isolation Module?
      The module is an electrical hub that connects a snow plow's lighting system with a vehicle's electrical system.
    • How do I know if my module is functioning correctly?
      Test by checking if both vehicle lights and snow plow lights operate as intended when plugged in.
    • Can I use a different module for my truck?
      No, ensure you use a compatible module designed for your specific truck model.

This guide provides essential information for those looking to install or troubleshoot their Fisher 4 Port Isolation Module. Proper wiring and connections will ensure optimal performance of your snow plow system.