Inboard Marine Ignition Coil Replacement For Thunderbolt IV And V HEI Systems Delivers Reliable Spark Easy Install And Better Start Power To Stop Hard Starts And Hot Runs Replaces 18-5438 392-805570A2 392-7803A4 392-805570A1 72115 40511

Inboard Ignition Coil Replacement for Thunderbolt IV & V HEI
✔️ Direct OEM-like ignition coil, replaces multiple numbers, easy install

Inboard marine ignition coil replacement designed for MerCruiser GM V6 and V8 engines with Thunderbolt IV and V HEI ignition systems. This direct-replacement coil sits beside the distributor to restore reliable spark, easy cold starts, and smooth operation on 4.3L, 5.0L, 5.7L, 6.2L, 7.4L and 8.2L petrol engines.

✅ Replaces Part# 18-5438, 392-805570A2, 392-7803A4, 392-805570A1, 72115, 40511, 9-29701, 64570, RL5438
✅ Fits Mercruiser GM V6/V8 engines with Thunderbolt IV & V HEI systems
✅ OEM-style replacement with factory-like fit and finish
✅ 2 years or 24,000 Mile warranty included
✅ Easy installation beside the distributor, saves dealer time and cost

💡 What is the purpose of an ignition coil replacement for Thunderbolt IV/V systems in Mercruiser engines? It helps restore reliable spark and smooth starts, especially when the original coil has weakened performance.

- Restores spark energy for reliable starts - Supports HEI Thunderbolt IV and V systems in Mercruiser engines - Simple DIY upgrade that saves time and money