Switch Box CDI 332-7778A12 18-5775 for Mercury Mariner 115 150 200 HP Outboard
Switch Box CDI 332-7778A12 18-5775 for Mercury Mariner 115 150 200 HP Outboard
Product Overview
CDI switch box part for Mercury and Mariner outboards from 115 HP to 200 HP. It replaces Mercury 332-7778A12, 332-7778A9, 332-7778A6, 332-7778A3, 332-7778A1, 332-7778A7 and 332-5524A1, plus Sierra 18-5775, CDI 114-7778, Mallory 9-25100 and the Chrysler / Force / US Marine 332-7778A12. The switch box triggers the coils; a failed one shows up as no spark, a motor that runs on some cylinders only, or an engine that cuts out once warm.
Specifications & Attributes
| Specification | Detail |
|---|---|
| Condition | New / New with tags |
| Type | Switch Box (CDI Unit) |
| Engine Type | Mercury / Mariner outboard |
| Horsepower Range | 115 HP - 200 HP |
| Warranty | Standard |
OEM Cross Reference
| Brand | OEM Part Numbers |
|---|---|
| Mercury / Mariner | 332-7778A12, 332-7778A9, 332-7778A6, 332-7778A3, 332-7778A1, 332-7778A7, 332-5524A1, 7778A12, 7778A9, 7778A6, 7778A3, 7778A1, 7778A7, 5524A1, F749301, F7778A9 |
| Sierra | 18-5775 |
| CDI | 114-7778 |
| Mallory | 9-25100 |
| Chrysler / Force / US Marine | 332-7778A12 |
Compatible Engines
Fits the following Mercury and Mariner outboards. Match the serial number range for your engine before ordering.
| Model | Serial Number Range |
|---|---|
| Mercury 50 HP 3-cyl | 6428681 - 0D000749 |
| Mercury 60 HP 3-cyl | 6428681 - 0D000749 |
| Mercury 65 HP | 4382057 - 4571651 |
| Mercury 70 HP | 4571652 - 5128279 |
| Mariner 70 HP | 5128280 and later |
| Mercury 70 HP | 5579016 - 6428680 |
| Mercury 70 HP 3-cyl | 0C272000 - 0D283221 |
| Mercury 75 HP 3-cyl | 0C272000 - 0D283221 |
| Mercury 80 HP 3-cyl | 0A996142 - 0C221999 |
| Mercury 90 HP 6-cyl | 5299506 and later |
| Mercury 90 HP 3-cyl | 0A996142 - 0D283221 |
| SportJet 90 HP | 0E023150 - 0E095087 |
| Mercury 105 HP Jet | 0D082000 - 0G303045 |
| Mercury 115 HP 6-cyl | 5314656 and later |
| Mercury V-135 | 0A904646 and later |
| Mercury 140 HP | 5327663 and later |
| Mercury 140 HP Jet | 0D082000 - 0G960499 |
| Mercury V-150 | 4868998 - 5129429 |
| Mercury V-150 | 5129480 - 0G960499 |
| Mercury V-150 XR2 | 6616991 - 0A904645 |
| Mercury XR4 / Magnum II | 0B242885 - 0D819999 |
| Mercury V-150 XR6 | 0D82000 - 0G960499 |
| Mercury V-175 | 4301235 - 5180108 |
| Mercury V-175 | 5180109 - 0G960499 |
| Mercury V-175 EFI | 5180109 - 0G960499 |
| Mercury V-175 XR1 | 5180109 - 0G960499 |
| Mercury V-200 | 4839034 - 5158928 |
| Mercury V-200 | 5158929 - 0G960499 |
| Mercury V-200 XR1 | 5158929 - 0G960499 |
| Mercury V-220 | 0B117316 and later |
| Mercury V-225 | 5628028 and later |
| Mercury (UK listing) | 275 HP |
What's Included
| Component | Qty |
|---|---|
| Switch Box (CDI Unit) | 1 |
Condition & Warranty
| Item | Detail |
|---|---|
| Condition | New / New with tags |
| Warranty | Standard |
| Packaging | Sealed retail packaging |
Before You Buy
- Verify your engine model and serial number before ordering
- Fits Mercury and Mariner 115, 150 and 200 HP outboards
- Check the stator, trigger and coils before replacing the switch box
- Inspect the connector pins for corrosion or heat damage
- 30-Day Easy Returns
- Free Worldwide Shipping
- OEM Quality Without the Markup
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Boat Owners' Review
Before You Buy
Frequently Asked Questions
What is your refund policy?
We offer a 14-day hassle-free return on all products. Items must be unused and in original packaging. Every XRmarine part is also covered by our 1-year warranty against manufacturing defects. If something is not right, email us at info@xrmarineparts.com — replacement or full refund, your choice.
See our full Refund Policy for complete details.
How does shipping work?
Free international shipping on every order — no minimums. We operate a global warehouse network with a main distribution centre in Asia (10-20 business days). We also hold stock in regional warehouses across the United States, Germany, the United Kingdom, Australia, and Poland (opening soon) — most orders arrive in 1-3 business days within those countries and in 2-8 business days to nearby regions. Tracking included.
See our full Shipping Policy.
How do you keep prices fair?
We cut out the middlemen. XRmarine sources directly from quality manufacturers and sells at honest prices. Same OEM-quality parts, no dealership markup. Every order comes with free shipping, real expert support, and a 1-year warranty.
Learn more on our About Us page.
What payment methods do you accept?
We currently accept PayPal — a fast, secure way to pay online. Credit card payments (Visa, Mastercard, American Express) and Shopify Payments are being set up and will be available soon. We appreciate your patience.