Posted by sflem849 on March 11, 2010 at 04:33:19 from (69.197.84.192):
In Reply to: Kill Switch posted by flopguns on March 10, 2010 at 18:32:28:
ScottyHOMEY said: (quoted from post at 20:48:56 03/10/10) I agree. The "normally closed" description is a little confusing. I grew up tih the old ST/DT, SP/SP nomenclature, which (I hope) still has some validity as such conversations go. To my ear, "normally open/closed" indicates a swith that requires a momentary action to make or break the circuit. It doesn't apply to switches with two defined positions.
Bottom line, if what Two Banger has in hand is an original style Farmall switch, he will need the two pole type designed for battery ignitions, which will have two poles on the bottom, both of which are insualted from ground. The single-pole type of the original Farmall switch, intended for magneto ignitions, grounds through its body, and does not provide any continuity (in either position) between a source of battery power and the igntion.
Yes all that throw pole technology is still around, but this isn't a normal switch. He got a kill switch to be used IN ADDITION to the ignition switch on the "dash." This is used if he comes unhooked from the sled so the tractor doesn't run away.
All the switches your referred to (SPDT, DPDT, etc) would be normally closed switches. SO when in the on position the circuit is completed. The one Denny's sold the guy is normally open, therefore the circuit is not completed when the switch is on.
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