Chaffed wire did some damage to a Semi-Scale GS-4 Daylight...I need help identifying the shorted components

Yellow part look like a MOV (metal oxide varistor) and more than likely the 39 Volt part from the "JVR" series:

http://www.joyin.com.tw/lan_en...d=Leaded%20Varistors

15KE33CA is a TVS (transient voltage suppressor); it's a generic part made many companies but here's one:

http://www.digikey.com/product....5KE33AGOS-ND/918188

Both are protection components.

Stan, what added protection does the MOV provide?  Would they be worth adding to the TVS' on our layouts or is the TVS sufficient?

mov's are good but normally only a one time shot they catch the spike or short and then self destruct.they are typically used a lot in powered terminal strips that have say 6     110 vac outlets. on powers stripts and there is a light to let you know if they have failed!

Alan

the tvs diodes are used more frequently these days and just fail typically as mentioned above generally short after catching spike rms voltage

A MOV won't die from a single transient, unless it's a whopper.

Where is the chaffed wire?  Remove the TVS diode and see if it is shorted?  Some one added that to the engine.  They placed it on the Motor driver AC input instead of at the Roller pickup.  Good chance the TVS shorted and that is your issue.   G

First off...Thanks all for the help identifying the parts and outstanding background information.

The chaffed wire was on the tender wiring harness. I do not recall what board or plug it was connected to. (I wrote it down and have it near the engine, so I know how to reinstall the harness.. just to prevent the dreaded old man's forgetful syndrome.)  When I refer to the tender harness, I am referring to the six pin harness that makes a connection to the steam engine. I do not think this was added on, rather it was  a factory install.  I completely removed this chaffed harness and swapped it with a harness from another K-Line locomotive (one which I owned from day one) in order to test the dead engine and it's boards. The new harness also had the diode and MOV attached. I doubt if those two items were aftermarket add-ons. With the slaved harness, everything worked as advertised. As for someone being in the dead engine prior to me, that is highly possible, as I found evidence of electrical tape covering slices vice heat shrink tubing. I have removed and replaced those as well.

As a precaution, I am replacing both parts.