Hello,
I have several Atlas O F3 units with no problems. However, I am having problem with one A unit
after years of trouble free operation.
I run this unit as part of an A & B power set, B unit runs with no problem, A unit has intermittent
"short" especially on entry into curves, I have rewired trucks, no change, ANY IDEA'S ???
Thanks,
ncng
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Item number? Picture of truck and wiring?
I had a 2-rail MTH unit some years ago that was built similar to the Atlas with the 2 motor drive. It had a siimilar problem. After watching it run upside down for awhile, and moving the axles around, I found that one the insulated wheel on one axle was a little cock-eyed. It wobbled just a little and in some situations it hit the center truck frame block and shorted.
I was about to force it more straight and the unit has run fine for about 8 years.
I've had an issue with two Atlas F3 A units coupled back to back. Somehow the short was through a coupler on curves. You may want to check that too.
Turn off the lights, run it and look for sparks.
Simon
Are the coupller boxes metal or plastic? All Atlas boxes used to be plastic. If these have metal boxes, Then what Chris is describing needs to be checked out. If run back to back (and B-units do have fronts and backs), then they could be shorting against each other.
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