I need your electrical expertise please!

[ezdays]

Okay, cool. I'm still having a hard time wrapping my brain around this one but that helps. I think what was messing me up was trying to figure it out with my leaders connecting to the bus line in two different places. It makes more sense to connect the feeders together and only tap in to the power in one spot.

Yup, you cannot connect two sets of leader wires to your power bus, two inputs (DC and DCC), one output. Use a heavy-duty DPDT switch, 5 or 10 amps would work.