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We wire a Zephyr for our track 3 & 4 and a 150 as a booster for track 1 & 2.
All four loops correctly.
We have the phasing correct and a common installed between the Zephyr, 150
and PM42.
When we crossover between track 2 & 3, we have a short on the PM42.
Any suggestion on how to correct this?
Show us a track plan please. The track plan is very basic. Each track (1, 2, 3 & 4) is a separate loop.
Also what switches are you using? Single crossover switches between loops.
Also, why the need for a booster on tracks 1 & 2? Track 1 & 2 are the main loops and we run multiple DCC engines. Track 3 & 4 are industrial loops with spurs.
It would still help if we could see a plan. Also I too believe the booster is not needed, unless you're running more than 8-9 sound equipped locos at a time. Based on your description, it sounds like you're running a max of 5-6, which the Zephyr can easily handle.
But more to the problem at hand. What brand track are you using? Some brands of track are power routing type and gaps need to be cut into the rails in specific places.