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I'm repairing an M10000 UP train for a client, and have run into an odd problem.

I have the cab and rear diner/lounge here (he kept the center car at his place) and, after replacing the rechargeable battery, changing the gear grease and lubing and cleaning the wheels, the cab car runs fine with working horn and F-N-R.

The odd part comes from the powered diner/lounge.  By itself, the diner lights up when track power.  But as soon as I plug the cab car into the diner, a dead short occurs.

I've checked the black and red (power) wires on both connectors, and checked continuity; the only time a short occurs is when the two units are plugged together.

Any suggestion as to what, specifically, to look for when I dive into the wiring? 

Thanks! 

Mitch

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We should have pickup one of the middle cars. You may have to go get one from Larry to see if the wiring plugs changes, The cars may have a common ground to outside rail, but some where on the way to the end car the plugs are switched over so when you plug the end car in the center rail wire is plugged into the wire that goes to the outside rail.

Plug the two cars together BUT keep the back car off of the track to see if you have short then.

@CBS072 posted:

We should have pickup one of the middle cars. You may have to go get one from Larry to see if the wiring plugs changes, The cars may have a common ground to outside rail, but some where on the way to the end car the plugs are switched over so when you plug the end car in the center rail wire is plugged into the wire that goes to the outside rail.

Plug the two cars together BUT keep the back car off of the track to see if you have short then.

That was my theory as well.  Larry wants me to look at his Galloping Goose, so I've asked him to bring the middle cars along as well.  With the back car off the track, there is no short circuit.

Mitch

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