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 John Hall
Thunderbolt V Coil Best Ignition Parts
The replacement coil looked like a Mercruiser coil but was slightly larger in diameter. Fits easily under a bonnet designed for a 3 year old. Also had an issue with the first coil where the negative contact sheared off during installation and was replaced quickly with no questions asked - great customer service!
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