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This Switch Box is an ignition system component compatible with Mercury Outboard models A1, A4, A6, A8, A10 and matches OEM Part# 339-6222, 18-5788, 114-6222.
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I needed a forklift part and wasn’t sure which one fit. They asked for the model and serial number, got back to me quickly, and made sure I ordered the right one. Really helpful.
Randy W. — Verified customer
Product Overview
This switch box regulates ignition timing and spark delivery for Mercury outboard engines, ensuring reliable starting and smooth operation. Designed for marine environments, it replaces worn or failed units on select two-stroke models. The switch box is a direct electrical replacement for OEM part numbers 339-6222, 18-5788, and 114-6222.
Key Features & Performance
- Direct replacement switch box for specific Mercury outboard engines
- Matches OEM specifications for ignition timing control
- Constructed with moisture-resistant materials for marine use
- Includes mounting bracket and wiring connectors for easy installation
- Rated for 12V DC electrical systems
Fitment & Compatibility
- Mercury Outboard models: A1, A4, A6, A8, A10
- Replaces OEM part numbers: 339-6222, 18-5788, 114-6222
Common Uses
- Replacement for failed or intermittent ignition switch boxes on Mercury outboards
- Restoring spark and timing in two-stroke marine engines
- Routine maintenance for boats used in saltwater or freshwater
Technical Specifications
- Part Number(s): 339-6222, 18-5788, 114-6222
- Product Type: Switch Box
- Voltage: 12V DC
- Application: Mercury Outboard (A1���A10)
Frequently Asked Questions
Q: Does this switch box work on all Mercury outboards? A: No, it is designed for models A1, A4, A6, A8, and A10 only. Verify your engine model before purchase.
Q: Is installation plug-and-play? A: Yes, it connects directly to the existing wiring harness and mounting points, using the factory connectors.
Product appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.