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Old 06-23-2020, 03:17 PM   #1
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Thunderbolt ignition

Does anyone know if the ‘77 MerCruiser 454 with the Thunderbolt ignition has points and a condenser? I don’t see any listed on a parts diagram.
We always used to change points, plugs, condenser, and cap all at the same time on our cars. I’m not very familiar with the Thunderbolt ignition.
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Old 06-23-2020, 03:21 PM   #2
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Thunderbolt was generally Mercruiser's name for electronic ignition systems. 1977 is older than the Thunderbolt IV system I'm familiar with, but it's almost certainly electronic (no points / condenser).
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Old 06-23-2020, 03:29 PM   #3
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Thanks!!
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Old 06-23-2020, 04:09 PM   #4
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Actually, one more question. So on this system, besides the cap and rotor what else should be replaced? Not counting plugs.
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Old 06-23-2020, 04:10 PM   #5
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Cap, rotor, plugs, and wires should be the only maintenance parts. On an electronic ignition everything else stays unless something fails.
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