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Maybe someone who has used the Aristo controller
would have more pertinent information. I don't
know anything about it.

However, two things come to mind. Do your
6 wheel truck locos draw appreciably more power
than your smaller locos? A multimeter set to amps in series
with one track lead from the power pack would
tell you. Does the Aristo breaker have a sensitivity
control?

I found this discussion thread on line. It may help.

http://cs.trains.com/mrr/f/744/t/272513.aspx

You didn't describe the track situation where the
loco shorts. Was it a straight away, serious curve,
turnout or the start of an elevation?

Don
 

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D&J is right. Your loco wheels could somehow
be shorting to the frame...or there could be a
loose or exposed conductor from the wheel
pickups that is shorting.

To check loco amp draw:
Your multimeter has a setting to measure amp draw.
Set the meter to AMPS.
(To use it, depending on the design of your meter,
you may have to move your probe leads to a different
jack.)

Then, disconnect ONE of the leads from your
controller from the track. Connect the controller
wire to one of your meter probes. Connect the
other meter probe to the track fee. This puts the
meter IN SERIES with the track bus. It therefore
measures the current draw of your loco. For the
test to be accurate, remove all locos and lighted
cars from the tracks, leaving only one of the 6 wheel
truck locos on the track. Slowly move your speed
control up and note the reading on your meter. It
should rise as the speed increases. Note the
reading when the loco triggers your 'breaker'.

Let us know what you find.

Another thought: How many DCC locos are operating
on your layout when the short occurs. Are there any
sound locos? They draw more current than non sound
locos.

Don
 
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