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  1. R

    No spark, 260 H.P. 87 Mercruiser V8 305 cid 4bbl. carb.

    I'm getting no spark after replacing old style mounted to the intake coil and pick-up in distributor. The engine only has 400 hrs. of use. Ignition is a thunderbolt 4. I am told that the brain is very reliable. I am getting plenty of power in and out of the coil, motor spins over good. Is there...
  2. R

    1987 Mercruiser 260 h.p. 350 ignition issues

    I am getting no spark. I have replaced the coil and the pick up in the distributor. There is a Thunderbolt IV breaker less ignition module that I believe is original equipment. I am told that this part rarely goes bad. yet I have no spark. There is power to the coil. There is one wire (looks...
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