You are missing the 2nd half of the reason to use a Frog-Juicer... it supplements the often poor electrical connection of the point rail connections to power the frog and frog rails... Particularly useful when used with power routing turnouts. The momentary act of one of the turnout points touching one of the stock rails causes the Frog Juicer to flip to the proper polarity and supply reliable power to the points, frog, frog rails and a track stub if you chose to do so. Of course there are other ways to do it involving SPDT switches. And it will not fix the operator issue of running into a turnout with the points thrown in the wrong direction.
---In WiringForDCC@..., <dfuligni2144@...> wrote :
If your operation can use the turnouts as power-routing units, you will not need to use the Frog Juicers. For example, they can be used for stub-ended spurs or yard tracks. Frog juicers are for use on isolated (insulated), unpowered frogs that are too long for your locos that will lose power passing over unpowered frogs because they have short-wheel-base pick-ups. (Or you can instal decoders with keep-alive function in those locos.)