Arco IG005 Ignition Coil — Mercury Outboard 75–400HP (2004–2018)
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
OEM-Grade Ignition Coil for Modern Mercury Outboards
The Arco IG005 is a direct-fit replacement ignition coil engineered for Mercury four-stroke and OptiMax outboard engines from 2004 through 2018. Covering a wide range of mid-range to high-horsepower applications from 75HP up to 400HP, it’s the go-to coil for maintaining peak ignition performance on modern Mercury powerheads.
Compatible Applications
- Mercury Outboard 75 HP (2004–2018)
- Mercury Outboard 80 HP (2004–2018)
- Mercury Outboard 90 HP (2004–2018)
- Mercury Outboard 100 HP (2004–2018)
- Mercury Outboard 115 HP (2004–2018)
- Mercury Outboard 135 HP (2004–2018)
- Mercury Outboard 150 HP (2004–2018)
- Mercury Outboard 200 HP (2004–2018)
- Mercury Outboard 225 HP (2004–2018)
- Mercury Outboard 250 HP (2004–2018)
- Mercury Outboard 275 HP (2004–2018)
- Mercury Outboard 300 HP (2004–2018)
- Mercury Outboard 350 HP (2004–2018)
- Mercury Outboard 400 HP (2004–2018)
Replaces OEM Part Numbers
- Mercury: 339-880615T01
- Sierra: 18-5154
- CDI Electronics: 184-0002
Parts Desk Insights
The IG005 is the correct coil for modern Mercury four-stroke and OptiMax outboards in the 75–400HP range — a completely different design from the older carbureted-era Mercury coils. It’s the first component to inspect when diagnosing a misfiring cylinder, rough idle, or hard starting on these engines. Because this coil covers a broad HP range across multiple engine families, always verify your engine’s model and serial number before ordering to confirm fitment. For older or smaller Mercury outboard ignition coil applications, see the Arco IG002 Ignition Coil. For MerCruiser inboard ignition sensor applications, see the Arco IG001 Ignition Sensor.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.