Posted by ScottyHOMEY on March 10, 2010 at 19:48:56 from (70.105.237.152):
In Reply to: Re: Kill Switch posted by sflem849 on March 10, 2010 at 19:22:23:
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.
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