Description
Sierra 18-5438 MerCruiser V6/V8 HEI Thunderbolt Ignition Coil is designed for GM V6 and V8 marine inboard/outboard engines equipped with MerCruiser Thunderbolt IV and V High Energy Ignition (HEI) systems. It is an oil-filled, remote-mount cannister style coil built to restore full engine power, reliable starting, and consistent high-voltage output.
Product Specifications
- Primary Resistance: 1.0 ± 15% ohms
- Secondary Resistance: 8 kOhms
- Voltage Input: 14V (± 0.5V)
- Style: Remote mount canister
- Compatibility: GM V6 and V8 marine petrol engines (including 4.3L, 5.0L, 5.7L, 350 MAG, 6.2L, 7.4L, 454 MAG, and 8.2L models)
Part Cross-Reference & Interchanges
This ignition coil is interchangeable with several major marine brand part numbers, making it a direct replacement for:
- MerCruiser / Mercury Marine: 392-805570A2, 392-7803A4, 392-7803, 392-805570A1, 300-8M0079202
- Crusader: 37068, R117004
- Mallory Marine: 9-29701
- GLM: 72115
