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OEM Mercury CDI Ignition Module
Mercury 8HP-15HP FourStroke CDI Unit 835401T1
This genuine OEM Mercury CDI ignition module is used on select Mercury 8HP, 9.9HP, 13.5HP, and 15HP 4-stroke outboards.
The CDI unit controls ignition timing and spark output for compatible carbureted Mercury small FourStroke engines. It replaces Mercury OEM numbers 835401, 8354011, and 835401T1.
Compatible Applications
| Engine Model | Engine Type | Serial Range | Application Notes |
|---|---|---|---|
| Mercury 8HP | 4-Stroke Carbureted | 0P086824 THRU 0P400999 | Bodensee / international applications |
| Mercury 9.9HP | 4-Stroke Carbureted 323cc | 0G760300 THRU 1B226999 | Select 9.9HP FourStroke models |
| Mercury 9.9HP | 4-Stroke Carbureted 323cc | 0P075166 THRU 0P400999 | Select 9.9HP FourStroke models |
| Mercury 13.5HP | 4-Stroke Carbureted | 0P134638 THRU 0P400999 | International applications |
| Mercury 13.5HP | 4-Stroke Carbureted | 0P401000 & Up | International applications |
| Mercury 15HP | 4-Stroke Carbureted 2-Cylinder | 0G760300 THRU 1B226999 | Select 15HP FourStroke models |
| Mercury 15HP | 4-Stroke Carbureted 2-Cylinder | 0P075166 THRU 0P400999 | Select 15HP FourStroke models |
| Mercury 15HP | 4-Stroke Carbureted 2-Cylinder | 1B227000 THRU 1B727495 | Select 15HP FourStroke models |
| Mercury 15HP | 4-Stroke Carbureted 2-Cylinder | 0P401000 & Up | Select 15HP FourStroke models |
OEM Part Numbers & Supersessions
| Type | Part Number |
|---|---|
| Current Mercury OEM Number | 835401T1 |
| Mercury Cross Reference | 835401 |
| Superseded Mercury OEM Number | 8354011 |
What This CDI Ignition Module is Used For
This Mercury CDI ignition module is part of the outboard ignition system. It helps control spark timing and ignition output so the engine can start, idle, accelerate, and run properly.
A failing CDI module may cause weak spark, intermittent spark, hard starting, misfiring, poor running, or no-start conditions.
CDI modules are commonly replaced during ignition troubleshooting after confirming related components such as spark plugs, ignition coils, kill switch wiring, stator output, and grounds are operating properly.
Using the correct OEM Mercury module helps maintain the proper ignition characteristics for compatible small Mercury FourStroke outboards.
Key Features and Benefits
- Genuine OEM Mercury CDI ignition module
- Fits select Mercury 8HP, 9.9HP, 13.5HP, and 15HP 4-stroke outboards
- Designed for compatible carbureted 2-cylinder Mercury FourStroke engines
- Controls ignition spark output and timing
- Direct replacement for Mercury 835401T1
- Replaces Mercury 835401 and superseded 8354011
- Common replacement during ignition system troubleshooting
- OEM Mercury fit and electrical compatibility
CDI Ignition Module Details
- Brand: Mercury Marine
- Part Type: CDI Ignition Module / CDI Unit
- Current OEM Number: 835401T1
- Cross Reference Numbers: 835401, 8354011
- Application: Mercury 8HP-15HP 4-Stroke Outboards
- System: Electrical / Ignition System
- Engine Type: Carbureted FourStroke
- Approximate Model Years: 1995-2006 models where applicable
FAQ
What engines does this CDI module fit?
This module fits select Mercury 8HP, 9.9HP, 13.5HP, and 15HP carbureted 4-stroke outboards depending on serial number range.
Is this an OEM Mercury part?
Yes. This is listed as an OEM Mercury CDI ignition module with manufacturer item number 835401T1.
Does this replace Mercury 8354011?
Yes. Mercury part number 8354011 has been superseded to 835401T1.
What are symptoms of a bad CDI module?
Common symptoms may include no spark, weak or intermittent spark, hard starting, misfiring, poor running, or no-start conditions.
Should I verify my serial number before ordering?
Yes. Mercury used different ignition components across similar horsepower models, so the engine serial number should always be checked before ordering electrical parts.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 (continental U.S.).
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1–5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Electrical parts should be installed only after diagnosis confirms the correct failure point.
- Items must be new, unused, and in original packaging.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
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835401T1
8354011