engine wiring help

Joe,

HAve you attempted to operate it with the cab removed? Is it a steamer (with tether) or diesel/electric?

 Yes the shell is off and I have it all apart and started dropping plugs 'til I found the short. It's a diesel but I'm upgrading a engine.

It's the polarity switch that's causing it. It looks OK on the outside but there's a dead short across the terminals. Replaced the switch and the short is now gone.

 I'm leary as the reason why it failed? It wasn't being thrown. The engine had started and after a new sound file was added the TIU could not find the engine? I put a different engine on the track and the tiu seemed scrambled. I recycled power and the layout was good. I put the first engine back on and got a dead short?

 So, was it just time for it to go or was there too many amps thru it for it to handle?? I'll find out. I hope not the hard way. Can't find any other short.

 OK engine now runs fine. I loaded a different sound file first to make sure it wasn't an issue. The system loaded the engine into the remote fast and it ran. I then connected the smoke unit and tested.

 I put back in the first soundset with crossing horn, and the loader stalled again at sector one as it did the very first time with this soundset only?  I pressed cancel a few times and then the loader started running again. It finished and the engine started.

 I then tried to load the engine into the remote and the system locked up a couple of times. On the third try, I got an out of range message and then after pressing a button, it read loaded into address #32. I started the engine and all seems fine.

 I can't help wondering why the system struggled to load with a certain soundset or if it was just coincidence? Ah well, it's working.

There are any number of corrupt sound files in the MTH database. There are some that will just not work even though it appears to come down fine without error messages. This has all been hashed out before. MTH is silent on the subject.

It's the polarity switch that's causing it.

What/where is that? I don't have one on my PS2 locos.

PS-2 3V units that are 2 Rail or 3 Rail Capable also come with a polarity switch for when the unit is in 2 rail mode.  G

 I didn't want to get in trouble for anything so I didn't post the rest of the info. It was an O gauge engine the guts came out of. However, I'm upgrading a G scale engine with all the guts.

 It is fixed. If anyone wants to know it's a sound file for a Genesis.

I'm pretty sure it was:

P101PP3GENESIS4AMT100512aFIN.mth

http://www.youtube.com/watch?v=g_ppSRUg6Ng&feature=c4-overview&list=UUibxZM9pcZwOpkZrcdHggpg

 I forgot to add a thank you to Chris for the board and to G and Ray, for the guidance!

Thanks to this forum, I have the nerve to try..