Constant voltage o22 switches

Unfortunately, the KW doesn't have a good ~14VAC fixed voltage match for the O22 auxiliary power with common ground with out limiting the variable track power to 14VAC also.

A second accessory transformer phased with common ground would be my recommendation.

Thanks tstark

Your KW transformer has a 14v post, which will be adequate to energize all the switches. For simplicity, I suggest that you connect one wire from that post to a terminal strip with a connector bar on one side, then run six wires from the other side of the terminal strip toward each O22 switch and install a 14v plug at the end of each wire.  There's a 14v jack on the side of an O22 switch; connect each 14v wire to the screw on a plug and insert them into the jacks.  Presto! Each switch will respond to that separate power source via the switch controllers.  No need for an add'l ground wire, since the switch is already grounded through the track rails. A drawing is attached for reference.

The small 14v plugs are available at dealers or online. This method is described in the Owners Manual for Lionel O22 switches.

Mike M.   LCCA 12394

@Mike H Mottler posted:

Your KW transformer has a 14v post, which will be adequate to energize all the switches. For simplicity, I suggest that you connect one wire from that post to a terminal strip with a connector bar on one side, then run six wires from the other side of the terminal strip toward each O22 switch and install a 14v plug at the end of each wire.  There's a 14v jack on the side of an O22 switch; connect each 14v wire to the screw on a plug and insert them into the jacks.  Presto! Each switch will respond to that separate power source via the switch controllers.  No need for an add'l ground wire, since the switch is already grounded through the track rails. A drawing is attached for reference.

The small 14v plugs are available at dealers or online. This method is described in the Owners Manual for Lionel O22 switches.

Mike M.   LCCA 12394

The KW does not have a common grounded 14V post unless you use the C terminal instead of the traditional U as your common ground. As noted above, using C as your common ground terminal limits the variable voltage to the track to 14VAC as well.

If using the traditional U for the common ground, wiring per that hand drawn diagram will be supplying 20VAC to the switches which is generally considered excessive and can cause components to heat up and melt. Some of this can be mitigated by using 2245 or 2447 bulbs in the switches and controllers, but again, the better recommendation is an accessory transformer.

@Mike H Mottler posted:

Your KW transformer has a 14v post,

Well, two. And none. "14V" is printed between the C & D posts(and you will get 14v between these two). Pick C And you get 6 volts relative to the tracks wired to A-U & B-U, pick D & you get 20 volts.