Review on Inboard Ignition Coil Replacement for MerCruiser Thunderbolt IV and V Ignition Systems with HEI - Replacing 18-5438, 392-805570A2, 392-7803A4, 392-805570A1, 72115, 40511 by Don Wilson
Fixed issues from 4.3 Mercruiser
Installed on Mercruiser 4.3 with Thunderbolt 4 ignition Perfect light matching. Fixed an issue that prevented my boat from starting when warm. Boat starts IMMEDIATELY when cold or warm. Couldn't be happier. The fact that it was less than 20% the cost of the original part was nice, and I ordered a replacement just in case and still saved over $60 compared to the OEM.
- Free for educational purposes
- Some issues
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