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332-7778A12 Mercury Switch Box | Genuine Used Part

332-7778A12 Mercury Switch Box | Genuine Used Part

$250.00 AUD
$250.00 AUD
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✓ Authorised Volvo Penta Dealer · Genuine used marine parts · Ships Australia-wide

🔧 Product Description

Genuine Mercury ADI Switch Box - Part Number: 332-7778A12

A genuine Mercury switch box / ignition module used on Mercury and Mariner ADI ignition systems. This module stores ignition energy from the stator and releases it to the ignition coils when triggered, providing spark control across compatible 2-cylinder, 3-cylinder, 4-cylinder and V6 two-stroke applications.

⚙️ Key Features

  • Genuine Mercury switch box / ignition module
  • Correct OEM part number 332-7778A12
  • ADI ignition-system switch box
  • Broad Mercury / Mariner two-stroke ignition family use
  • Cross-references with CDI Electronics and Sierra replacement modules

🚤 Compatibility

Commonly used on

  • Mercury / Mariner ADI two-stroke outboard ignition systems

Typically suits

  • Engine models:
  • Mercury 50HP ADI ignition applications
  • Mercury 60HP ADI ignition applications
  • Mercury 70HP ADI ignition applications
  • Mercury 75HP ADI ignition applications
  • Mercury 80HP ADI ignition applications
  • Mercury 90HP ADI ignition applications
  • Mercury 105 Jet ADI ignition applications
  • Mercury 115HP ADI ignition applications
  • Mercury 135HP V6 ADI ignition applications
  • Mercury 140HP ADI ignition applications
  • Mercury 150HP V6 ADI ignition applications
  • Mercury 175HP V6 ADI ignition applications
  • Mercury 200HP V6 ADI ignition applications
  • Mercury 220HP ADI ignition applications
  • Mercury 225HP V6 ADI ignition applications
  • Mercury 250HP V6 ADI ignition applications
  • Mercury 275HP V6 ADI ignition applications
  • Mariner matching ADI ignition applications using 332-7778A12
  • HP Range: commonly 50HP - 275HP where the serial-numbered ignition diagram specifies the 7778 switch box family
  • Engine Type: Mercury / Mariner two-stroke ADI ignition outboard
  • Year Range: Broad late-1970s through 1990s ADI ignition family use depending on horsepower
  • Serial Note: Match by exact Mercury serial-numbered ignition diagram, number of switch boxes fitted and wiring colour layout.

🔌 Function

The switch box stores stator-generated ignition energy and releases it to the ignition coils when triggered, creating spark at the correct timing point.

⚠️ Common Signs of Failure

  • No spark on one bank or selected cylinders
  • Intermittent spark loss when hot
  • Misfire under load
  • Hard starting or no-start condition
  • Spark returns when switch box is substituted
  • Stator and trigger test correctly but spark remains absent
  • Switch box damage from kill-circuit voltage or water ingress

🔄 Supersession & Cross Reference

OEM Supersession Chain

  • 332-7778A12 later Mercury switch box reference
  • 332-7778A9 earlier related switch box reference
  • 332-7778A6 earlier related switch box reference
  • 332-7778A5 earlier related switch box reference
  • 332-7778A3 earlier related switch box reference
  • 332-7778A1 earlier related switch box reference
  • 332-5524 earlier switch box reference

OEM / Related Numbers

  • 332-7778A12
  • 7778A12
  • 332-7778A9
  • 332-7778A6
  • 332-7778A5
  • 332-7778A3
  • 332-7778A1
  • 332-5524
  • 7778A1
  • 7778A3
  • 7778A5
  • 7778A6
  • 7778A9

Aftermarket / Verified Equivalents

  • CDI Electronics: 114-7778
  • Sierra: 18-5775
  • Redline / aftermarket: RL5775
  • Aftermarket switch box replacements using 114-7778 reference

📦 Condition

  • Genuine used part
  • Removed from running engine where applicable
  • In good working condition unless otherwise stated

Shipping & Delivery

Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.

Returns & Warranty

14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in the condition you received it for a refund or exchange. Full details in our Refunds & Returns policy.

Not sure this fits?

Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.

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