[GreenKeys] Four-prong wiring question on M19s...

[Jim Haynes]

I haven't seen any converted ones, unless maybe ones I converted myself
because they were not going to be used with an electrical service unit.
Converted to 3 wires means you are not going to be using the switched
AC for anything.  But then the electrical service unit is fairly
unnecessary in typical amateur service.

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 	"Ya can argue all ya wanna, but it's dif'rent than it was."
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 		Meredith Willson, The Music Man