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Ignition interrupter on outdrives
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trontek
#1 Posted : Thursday, July 02, 2009 1:12:06 PM(UTC)
trontek

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Is this just a switch and, if so, is it NO or NC? Is this device connected to the primary of the coil? Anyone have a link where I can find schematic diagram?

Thanks,

Jim

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dougrose
#2 Posted : Friday, July 03, 2009 12:13:12 AM(UTC)
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What make and model are these outdrives?


1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida
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trontek
#3 Posted : Friday, July 03, 2009 3:59:38 AM(UTC)
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Just in general, dougrose. I find lots of info on what it is and how to adjust and so forth, but nothing to tell me how it works. Does it just open the DC to the primary of the coil?

Jim

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trontek
#4 Posted : Sunday, July 05, 2009 2:05:30 AM(UTC)
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I've found that it has been done both by interrupting the positive to the top of the coil and by grounding the bottom....mostly the latter.
Jim

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dougrose
#5 Posted : Sunday, July 05, 2009 2:23:18 AM(UTC)
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Most magneto-powered engines (like the 90 hp Johnson on my fishing boat) are turned off by shorting across the points. This is often done using a wire connected to the hot side of the points that is connected to ground to stop the engine. I have a toggle switch for the ignition. It is double-pole double-throw. When it is switched on, the battery is connected to the ignition (purple) so that the start switch can drive the starter solenoid. When it is switched off, the other side of the switch connects the magneto points to ground, stopping the spark. I believe that this is pretty common.

For a point-and-coil ignition like in cars or Marinettes, the engine is normally stopped by simply removing the power to the coil by turning off the ignition switch.


1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida
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