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Vintage Johnson Coil Resistance
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<blockquote data-quote="BrayD" data-source="post: 505562" data-attributes="member: 24554"><p>Posting here rather than in the electrical forum as it's related to motors. </p><p></p><p>I picked up a '57 18hp Johnson a few weeks ago and I'm freshening up the ignition. Looks like the coils have been replaced at one time, and I have one that is reading pretty high across the secondary. I still have spark at the plug, and my understanding is a higher secondary resistance will just produce a stronger spark. Resistance across the primary is just over 1ohm on each coil.</p><p></p><p>I admittedly only have a superficial understanding of these things though. </p><p>In an effort to be frugal, I'd like to run it as-is if it won't hurt anything. Will the higher resistance cause any performance issues or risk early failure of other components?</p><p></p><p>[ATTACH=full]117356[/ATTACH]</p></blockquote><p></p>
[QUOTE="BrayD, post: 505562, member: 24554"] Posting here rather than in the electrical forum as it's related to motors. I picked up a '57 18hp Johnson a few weeks ago and I'm freshening up the ignition. Looks like the coils have been replaced at one time, and I have one that is reading pretty high across the secondary. I still have spark at the plug, and my understanding is a higher secondary resistance will just produce a stronger spark. Resistance across the primary is just over 1ohm on each coil. I admittedly only have a superficial understanding of these things though. In an effort to be frugal, I'd like to run it as-is if it won't hurt anything. Will the higher resistance cause any performance issues or risk early failure of other components? [ATTACH type="full"]117356[/ATTACH] [/QUOTE]
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