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France, Paris
1 Level
721 Review
38 Karma

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 Jeff Wyble

Revainrating 2 out of 5

Not compatible with coils

Mercruiser owners beware - the specifications on this do NOT match those listed in the owner's manual for a Mercruiser 4.3 engine with a Thunderbolt iv or v system. Bench tested at 1.5 ohms and Mercruiser specs are 0.6-0.9 ohms. The main seller offered a full refund after several emails trying to explain that the product was not up to specification for a 4.3 or even 5.0 Mercruiser.

Pros
  • Quality construction
Cons
  • Modern