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339-7452A3 Mercury Switch Box | Genuine Used Part

339-7452A3 Mercury Switch Box | Genuine Used Part

$90.00 AUD
$90.00 AUD
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🔧 Product Description

Genuine Mercury Switch Box / CDI Module - Part Number: 339-7452A3

A genuine Mercury switch box / CDI ignition module used on selected Mercury and Mariner two-cylinder two-stroke outboards. This capacitor discharge ignition pack controls spark triggering from the stator and trigger circuits to the ignition coils.

⚙️ Key Features

  • Genuine Mercury switch box / CDI module
  • Correct Mercury part number 339-7452A3
  • Used on selected 18HP, 20HP, 25HP, 35HP and 40HP two-cylinder Mercury / Mariner engines
  • Cross-references with CDI Electronics 114-7452A3
  • Also crosses with Sierra 18-5776 and Mallory 9-25101 style replacements

🚤 Compatibility

Commonly used on

  • Mercury / Mariner two-cylinder two-stroke CDI ignition systems

Typically suits

  • Engine models:
  • Mercury 18HP 2-cylinder two-stroke - 1980-1987
  • Mercury 20HP 2-cylinder two-stroke - 1980-1987
  • Mercury 25HP 2-cylinder two-stroke - 1980-1987
  • Mercury 35HP 2-cylinder two-stroke - 1980-1987
  • Mercury 40HP 2-cylinder two-stroke - 1980-1987
  • Mariner 18HP 2-cylinder two-stroke - 1980-1987
  • Mariner 20HP 2-cylinder two-stroke - 1980-1987
  • Mariner 25HP 2-cylinder two-stroke - 1980-1987
  • Mariner 35HP 2-cylinder two-stroke - 1980-1987
  • Mariner 40HP 2-cylinder two-stroke - 1980-1987
  • HP Range: 18HP - 40HP
  • Engine Type: Mercury / Mariner two-cylinder two-stroke outboard CDI ignition system
  • Year Range: approximately 1980 - 1987
  • Serial Note: Match by exact Mercury / Mariner serial number, original switch-box number, wiring colours, connector style and ignition-system diagram before installation.

🔌 Function

The switch box receives stator and trigger inputs, stores ignition energy and fires the ignition coils at the correct timing point.

⚠️ Common Signs of Failure

  • No spark on one or both cylinders
  • Weak or intermittent spark
  • Engine starts then loses spark
  • Misfire under load
  • Heat-related ignition failure
  • Kill circuit or stop wire fault damaging the module
  • Spark returns when a known-good switch box is fitted
  • Burnt, cracked or corroded switch-box terminals

🔄 Supersession & Cross Reference

OEM Supersession Chain

  • 339-7452A3 Mercury switch box reference
  • 339-7452A2 earlier related Mercury switch box reference
  • 339-7452A1 earlier related Mercury switch box reference

OEM / Related Numbers

  • 339-7452A3
  • 3397452A3
  • 7452A3
  • 339-7452A2
  • 3397452A2
  • 7452A2
  • 339-7452A1
  • 3397452A1
  • 7452A1
  • 899883230
  • Switch box
  • CDI module
  • Capacitor discharge ignition pack
  • Ignition switch box

Aftermarket / Verified Equivalents

  • CDI Electronics: 114-7452A3
  • Sierra: 18-5776
  • Mallory: 9-25101

📦 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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