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Old 15 November 2007, 05:55   #31
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Stolen from JF's place.

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When a boat looks that good who needs tubes!!!
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Old 15 November 2007, 07:36   #32
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on a similar theme.....

Anyone ever wired up a "deadman active" lamp? I'm thinking the scenario of my old (nay, ancient) '72 vintage Johnsorude, where the deadman literally just short circuits the low voltage side of the magneto ignition, and is the usual "need cord attatched to hold switch open".

Picture the scene in my "unlikely but you know what sod's law is like on a bad day" scenario - you're motoring along, and something random happens like the fuel tank shifts slightly in the swell, and breaks one wire core out the pin on the engine plug. A few mins later as a result of said waves you go over the side - only to discover as the boat hares off without you, that the switch may be closed, but the short is not present due to the broken wire!


My thought was a very high resistance type lamp (possibly a neon or an LED with a big resistor?) in parallel with the switch - the voltage from the ignition would keep it lit, showing you there was contact 'tween the switch & the engine. I suspect the juice to run the lamp may however knacker any hope of getting a decent spark...... Any electrical gurus out there like to comment?
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Old 15 November 2007, 10:35   #33
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... like to comment?
Wot a worrier. I bet you have difficulty crossing the road.
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Old 15 November 2007, 11:15   #34
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Originally Posted by 9D280 View Post


My thought was a very high resistance type lamp (possibly a neon or an LED with a big resistor?) in parallel with the switch - the voltage from the ignition would keep it lit, showing you there was contact 'tween the switch & the engine. I suspect the juice to run the lamp may however knacker any hope of getting a decent spark...... Any electrical gurus out there like to comment?
It wouldn't work. If the switch fails internally or the wires fall off the switch then as long as you still have contact with the light the lamp will stay lit-ie your killcord won't work but the lamp will tell you it's OK.

The only thing that'll tell you if your killcord has failed is taking the cord off and the engine not stopping unless you want to build complex ICs to measure resistance.
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Old 15 November 2007, 11:52   #35
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Quote:
Originally Posted by 9D280 View Post
Anyone ever wired up a "deadman active" lamp? I'm thinking the scenario of my old (nay, ancient) '72 vintage Johnsorude, where the deadman literally just short circuits the low voltage side of the magneto ignition, and is the usual "need cord attatched to hold switch open".

Picture the scene in my "unlikely but you know what sod's law is like on a bad day" scenario - you're motoring along, and something random happens like the fuel tank shifts slightly in the swell, and breaks one wire core out the pin on the engine plug. A few mins later as a result of said waves you go over the side - only to discover as the boat hares off without you, that the switch may be closed, but the short is not present due to the broken wire!


My thought was a very high resistance type lamp (possibly a neon or an LED with a big resistor?) in parallel with the switch - the voltage from the ignition would keep it lit, showing you there was contact 'tween the switch & the engine. I suspect the juice to run the lamp may however knacker any hope of getting a decent spark...... Any electrical gurus out there like to comment?
How about testing it every time you go out - this should be standard procedure and is often done in the scrutineering process for offshore races, although not - it appears - in South Africa!
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When a boat looks that good who needs tubes!!!
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Old 15 November 2007, 14:32   #36
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Many thanks Polwart for taking the time to post your drawings. One question which is bound to show my lack of electrical know how.....

Can a dead man switch be wired to be broken circuit when the dead man leash is attached and then live when the leash is removed ( does this make sense so far ?)
i'm guessing it is the reverse of the way it works in the control box but is it possible to wire in such a way or do we need to buy a special type of dead man ?

My dad would be ashamed he was an electrical engineer ... should have paid more attention i can hear him saying

Honest i can drive a boat better than my wiring

Thanks again for your help.
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Old 15 November 2007, 14:36   #37
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K&S, I think you'll fine HERE near the bottom of the page, the switches (The top Piccy) that will perform the function you talk about.
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Old 15 November 2007, 14:38   #38
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Many thanks Polwart for taking the time to post your drawings. One question which is bound to show my lack of electrical know how.....

Can a dead man switch be wired to be broken circuit when the dead man leash is attached and then live when the leash is removed ( does this make sense so far ?)
i'm guessing it is the reverse of the way it works in the control box but is it possible to wire in such a way or do we need to buy a special type of dead man ?

My dad would be ashamed he was an electrical engineer ... should have paid more attention i can hear him saying

Honest i can drive a boat better than my wiring

Thanks again for your help.
Thats the way it works on most 2-strokes.
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Old 15 November 2007, 14:55   #39
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The kill switches I have are 4 terminals, 1 pair are normally closed and the other pair normally open, so can be used either way.
Richard
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Old 15 November 2007, 15:06   #40
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re MOB

I suppose a Mirror on the consoul would just be tooooo simple
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