Switch Box / Power Pack – Fits Mercury & Force 3 & 6 Cyl 50-275 HP (Replaces 332-7778A12, 332-7778A9, 332-7778A6)

Switch Box / Power Pack – Fits Mercury & Force 3 & 6 Cyl 50-275 HP (Replaces 332-7778A12, 332-7778A9, 332-7778A6)

This switch box power pack is a direct replacement for 3 & 6 cylinder Mercury and Force outboards from 50 to 275 HP, specifically designed for models using an Alternator Discharge Ignition (ADI) system. It ensures reliable spark timing and engine performance, restoring your outboard's ignition system to factory standards.

This unit directly replaces multiple OEM and aftermarket part numbers, offering a versatile solution for a wide range of engine models primarily from the 1980s through the 2000s.

• Installation: Direct bolt-on replacement with color-matched wiring.
• Construction: Fully potted, epoxy-sealed unit for marine-grade durability and protection against moisture and vibration.
• Function: Restores spark and ignition timing for ADI systems.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands. Ensure your existing part number is listed below for guaranteed compatibility.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

This package includes:

• 1 x Switch Box CDI Power Pack (Replaces OEM P/N 332-7778A12)

Installation Guide

Professional installation is recommended. The general steps are as follows:

1. Disconnect Power: Completely disconnect the battery terminals to prevent electrical shorts.
2. Locate the Old Unit: Find the existing switch box on your engine. It's typically a black, sealed box with multiple wires.
3. Disconnect Wiring: Carefully unplug all wire harness connectors from the old switch box. Note their positions if they aren't color-coded.
4. Remove Old Switch Box: Unbolt the old unit from its mounting location.
5. Mount New Switch Box: Secure the new switch box in the same location using the original hardware.
6. Connect Wiring: Plug the wiring harnesses into the new switch box, ensuring the color-matched wires align correctly.
7. Reconnect Battery: Reattach the battery terminals, starting with the positive lead.
8. Test Operation: Start the engine and verify it runs smoothly. Check for consistent spark on all cylinders if issues persist.

Troubleshooting & FAQ

Q: How do I confirm this switch box will fit my Mercury engine?

A: This switch box fits a wide range of 3 & 6 cylinder Mercury and Force outboards (50-275 HP) that use an ADI (Alternator Discharge Ignition) system. The most reliable way to confirm compatibility is to match the part number from your old switch box to one of the numbers listed in our Part Number Cross-Reference table (e.g., 332-7778A12, 18-5775, 114-7778). You can also use the serial number ranges in the Compatible Engine Models table to check your specific model.

Q: What are common signs that my original switch box is failing?

A: Symptoms of a faulty switch box include: no spark on one or more cylinders, intermittent or weak spark, engine misfiring (especially at high RPM), backfiring, or a complete failure of the engine to start.

Q: OEM vs. Aftermarket?

A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?

A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?

A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.