Sierra 18-5186 Ignition Coil for Mercury, Mariner and Force Outboards
Sierra 18-5186 Ignition Coil for Mercury, Mariner and Force Outboards
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SKU:SIE-18-5186
Brand Sierra Part No. 18-5186 UPC 030999236814
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Sierra 18-5186 is a replacement ignition coil for Mercury and Mariner outboards and for Chrysler and Force outboards. It crosses to a long run of Mercury coils, including 339-7370A2 through 339-7370A23, 338-4995A1 and 339-832757A4, and to Force F718475.
Coverage runs from small Mercury outboards (6 to 25 HP) up through V-150 models, plus Chrysler and Force 40 to 150 HP outboards, each within the serial ranges in the fitment list. Match your engine's horsepower and serial number to that list before you order.
Fits / Replaces
Specifications
Specifications
- Component: Ignition coil
Features
- Fits Mercury, Mariner, Chrysler and Force outboards within listed serial ranges
- Crosses to Mercury 339-7370 and 339-832757 series coils
- Built to meet or exceed OEM requirements (Sierra)

Which engines does the Sierra 18-5186 fit?
Mercury and Mariner outboards from 6 HP up through V-150 models, and Chrysler and Force 40 to 150 HP outboards, each within a specific serial range. The full list is in the fitment section on this page; match your horsepower and serial number before you order.
Which coil part numbers does it replace?
Mercury 339-7370A2, A6, A8, A13, A16, A17, A19, A23 and 339-7370B13, 338-4774A1, 338-4995A1 and A2, 339-832757A3, A4 and B4, and Chrysler/Force F718475. It also crosses to Mallory 9-23200.
Does it cover Mercury race and Sport Jet coils?
It crosses to the coil numbers listed for Mercury race outboards (339-7370A13 and 339-832757A4) and for Mercury Sport Jet (339-832757A4). Check your engine's serial number against the fitment list before you order.