Mercury Mariner Force CDI Switch Box 332-7778 18-5775 300-01852
300-01852
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- 30 Day Return Policy
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Mercury / Mariner CDI Switch Box
Aftermarket ignition power pack replacing 332-5524 and 332-7778 families
Aftermarket switch box for selected distributorless Mercury and Mariner three- and six-cylinder outboards, plus limited Force applications, where the engine parts diagram specifies the listed OEM references.
Key Features
- Aftermarket CDI switch box / power pack
- For selected Mercury and Mariner 3- and 6-cylinder ignition systems
- Multiple 332-5524 and 332-7778 supersessions
- Plug-compatible only when connectors and OEM number match
- Marine-rated encapsulated electronics
- One switch box supplied
Technical Specs
| Part type | CDI switch box / ignition power pack |
| Ignition type | Selected distributorless CDI systems |
| Cylinder families | 3-cylinder and 6-cylinder, application dependent |
| Supply | 1 switch box |
| 4Boats SKU | 300-01852 |
Compatibility / Fitment Guide
| Application | Verified fitment | Checks / exclusions |
|---|---|---|
| Mercury / Mariner 50 HP 3-cylinder electric start | Selected 1986–1990 applications; serial 0A912478 through 0D000749 | Confirm 332-7778/332-5524 family reference |
| Mercury / Mariner inline-6 90 HP | Selected late-1970s to mid-1980s applications using the listed switch box | Serial and wiring-diagram match required |
| Mercury V6 outboards | Selected models whose parts diagram lists a 332-7778 supersession | Some engines use two boxes; do not mix unmatched ignition parts |
| Force 70 / 90 HP | Limited applications only | Order only with matching OEM reference and connector layout |
| CDM, ADI variants with different plugs, EFI ECU ignition | Not automatically compatible | System architecture must match |
Before ordering: Troubleshoot stator, trigger, coils, grounds, stop circuit and wiring before replacing the switch box. Electrical parts should be installed by a competent marine technician.
Part Number Cross Reference
| Mercury / Mariner | 332-5524; 332-5524A1 |
| Mercury / Mariner supersessions | 332-7778; A1; A3; A5; A6; A9; A12; A14 |
| CDI Electronics | 114-7778 |
| Sierra | 18-5775 |
| Mallory | 9-25100 |
| EMP / 4Boats | 300-01852 |
Frequently Asked Questions
Will this cure a no-spark fault?
Only if testing identifies the switch box as faulty. Stator, trigger, stop circuit, coils and grounds can cause similar symptoms.
Does it fit every three- or six-cylinder Mercury?
No. OEM number, serial range and connector layout must match.
Can two different switch boxes be mixed on a V6?
Do not mix mismatched boxes; follow the engine service manual and replace as a matched specification where required.
Is it returnable after installation?
Electrical components are generally difficult to accept back once fitted; confirm fitment and diagnosis before connecting it.
Installation note: Disconnect the battery, label every lead, clean grounds and transfer one wire at a time. Never use an automotive test light on CDI circuits; use the manufacturer's specified DVA/ohm test procedure.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
