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I know a bunch of people were standing on the sidelines and not bidding on the MTH auction for this very reason.  I was the lucky winner of Lot 124, UP SD70Ace 8357 - twin to the engine that got me back into the hobby.  $165 plus $24.75 premium plus $35 shipping.

It arrived yesterday.  It was without a box.  There was no box in the auction pictures, and presumably if they have a box they'll include a picture.  Instead, it was very tightly wrapped in bubble wrap.  The engine itself is in really good condition.  The small bar thing low down at the very back end was loose and the mounting brackets broken on one side.  It had to have been from the tight bubble wrapping because all of the parts were held in place.  No big deal, I can fix that.  The engine was dusty but overall reasonably clean and in otherwise excellent condition.

It's a PS 3 engine.  When I put it on the tracks there was a very loud buzzing noise.  Turns out the front coupler is stuck uncoupling itself repeatedly - so fast it's basically vibrating.  It got VERY hot VERY quickly.  I have zero idea how to fix this.  The wires attaching the coupler to the coil look intact and I don't see any obvious shorts.  It would not respond to the remote commander remote - I don't have access to real DCS.  Do any of you have any ideas as to what might be causing this?

Thanks!

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the ps3 board probably has a shorted FET that drives the coupler so it is on all the time.I would disconnect the coupler harness from the coupler and then you can run the engine and the rest of board will probably work alright ! make sure you monitor the current draw when powering up the engine if current it getting over a amp shut engine  off immediately i have  a asc tech repair your engine!

Alan

Last edited by Alan Mancus

Thanks to both Alan and John.  I FINALLY got time to disassemble the locomotive today.  (Two toddlers and a job = little train repair time.). The wire to the coupler and another small black wire look like they had gotten pinched when the body was put on and the insulation rubbed off and both had wire exposed.  I'm sure they were shorting.  I wrapped both in electrical tape and reassembled and the train works GREAT!  The front coupler is now stuck open and inoperative but that doesn't bother me a bit.  

Even better, I've now had my first experience of opening a train body and repairing something and putting it back together successfully!

Thanks again for your help, gents!

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