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Can't bachmann reversing trolley to run on extended layout

We are running the trolley on an extended layout of approximately 50 board feet. There are four wires coming out of the controller. Blue, white, green, and yellow. how do I wire up the track to get the trolley to run on code 100 track like it does on the prewired snap track?

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Hi Papajj,

HO scale has only the tracks to convey power, therefore ultimately only two wires will be needed.

The original setup had the Power Pack separate from the variable speed controller. There was also the 'Bump Stop' reversing capability function of the snaptrack.

I assume your new layout is a continuous loop with the auto reverse no longer needed.

So to go directly from the controller to your new setup you need to identify which of the wires are responding to the the controller.

You will need a voltmeter set to DC. A digital would be preferable since we are unsure of polarity.

  • Set the controller to midrange
  • Pick a color for one lead then check the other three with the other lead.
  • When the meter registers, adjust the speed controller. When you turn it up, does the meter register an increase? (keep in mind the increase may be negative since the poles can be reversed. This is ok).
  • These are the two wires you need to attach to your new track layout.
Happy Holidays and Thanks for using FixYa


Posted on Dec 02, 2008

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This is guess on my part. But I think it will work.
First take a look underneath the trolley, there should have 4 contacts.
Now you need a voltmeter, put the control in forward, measure the track in pair, 1&2, 3&4 1$3, 2&4, without the trolley, and write down the reading.
Now put the control in reverse, and do the same measurement.
You should a good idea what is hot when the trolley in forward and what is hot in reverse. Wire the track accordingly.
You should be in business.

Posted on Dec 02, 2008

  • Frank
    Frank Dec 02, 2008

    The other method is the apply votage to the trolley contact in pair and find out which 2 pair is for forward and which is for reverse. wire the track accodingly.


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