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    2010 4.3L TKS Thunderbolt Ignition Troubleshooting

    I am not sure it is fixed either. I measured ohms between the WHT/BLK wire (the side that is coming from the Interrupt switch) to ground and it was completely open. Absolutely no connectivity to ground. I was expecting to see this connected to ground if the interrupt switch had failed. I went...
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    2010 4.3L TKS Thunderbolt Ignition Troubleshooting

    I found this thread "How Mercruiser Thunderbolt ignition systems work" Lots of good information here. I zeroed in on this comment "For troubleshooting I always remove the tacho feed wire and the white/green to the shift interrupt switch, eliminating them as a possible cause of a problem". Easy...
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    2010 4.3L TKS Thunderbolt Ignition Troubleshooting

    It's an aftermarket ignition sensor that I got off of Amazon. I don't see a name brand on it anywhere. The black wire is grounded really well. Is there a way to check the ignition sensor itself?
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    2010 4.3L TKS Thunderbolt Ignition Troubleshooting

    I have a 2010 Larson with Mercruiser 4.3L TKS (carb) that has no spark. Sometimes it does get spark when I am troubleshooting (rare 1 in 25 attempts). I have ran down the Thunderbolt troubleshooting flow chart and I get spark on the coil with a tester and manually striking ground with the...
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