OEM Coil Ignition

Quicksilver OEM Coil Ignition

The Quicksilver 841203T is a genuine factory OEM ignition coil manufactured by Mercury Marine for use in MerCruiser inboard and sterndrive gasoline engines. As part of the Mercury Marine and Quicksilver family of components, this ignition coil is engineered to meet the exact specifications of the original equipment it replaces, ensuring consistent ignition timing and reliable engine performance in demanding marine environments.

This coil fits a wide range of MerCruiser high-performance engine configurations, including the 520, 525 EFI, 540, and the full 8.2L Mag and Inboard EC series across multiple serial number ranges. It is the correct replacement for applications such as the MCM 8.2L Inboard (Base and H.O.) EC series, 8.2L Mag (Base and H.O.) models, and the 525 EFI sterndrive variants. Always confirm compatibility by matching the serial number of your specific engine before ordering.

Because this is a genuine OEM part — not an aftermarket reproduction — it is built to the same standards as the component installed at the factory. The part ships in new condition and is identified by its UPC barcode 745061572652 for verification at point of purchase.

Key Features

• Genuine Mercury Marine OEM factory replacement ignition coil
• Part number 841203T; UPC 745061572652
• Fits MCM 525 EFI and MerCruiser 8.2L Inboard and Mag engine families across multiple serial number ranges
• Compatible configurations include 520 (0M970122 & Up), 525 EFI (multiple serial ranges), 540 (0M970866 & Up), 8.2L Mag Base and H.O., and 8.2L Inboard Base and H.O. EC series
• New condition; exact OEM fitment guaranteed
• Compact dimensions: approx. 4.00" L × 3.60" W × 6.00" H; weight approx. 1.10 lbs
• Manufactured and distributed under the Mercury Marine / Quicksilver brand family