Trainman203  done that, seems to be working great. Now I'm trying to figure out what size resistor to use on an LED headlight. I bored out the back of the headlight and a 3mm LED fits great...Tried a 1k resistor, seems to be too bright, going shopping for some larger # resistors. Thanks for all your help....breezy8

Bill, It works just fine now. Followed the suggestions and did some tweeking on my own  Although CV 116 does not apply to steam. 

Sorry about the double post....the site didn't show that the first had posted....sorry

I should clarify a bit. Both wires coming from the "light board" are black....which is the "RED" or +, and the other wire would still be the black or -.....I plan on using a 580 ohm resistor, but I need to know the polarity to correctly wire the LED......Thanks again..breezy8

I should clarify a bit. Both wires coming from the "light board" are black....which is the "RED" or +, and the other wire would still be the black or -.....I plan on using a 580 ohm resistor, but I need to know the polarity to correctly wire the LED......Thanks again..breezy8

What is the proper way to wire a 3mm LED to the headlight on a LT MTN 4-8-2 It is now set up and runs on DCC. It has the board in the tender and I added w/ 8 pin plug a Sound traxx ECONOMI DECODER.  after so fiddleing, it runs great. .Now  I need to add a LED headlight...Thanks so much   breezy8

Thanks again trainman 203. I will give it a try today.......breezy8

trainman 203.... Just one question before I start.  As I read the instructions you sent, after I set CV 2,3,4,209 & 210 to ZERO....I adjust all the other cv's as stated BUT do nothing to CV 2?   does cv 210 do this???  Thanks again...breezy8

Thanks trainman...I will give it a try and let you know....Thanks again....

trainman 203.....I followed the link you sent to a "t"....now I don't have
ANY slow speed.....at speed step 1   it runs like speed step 4 or5...am I doing something wrong..?Thanks   reezy8

I just received a replacement (under warrentee) of a 4-8-2- Lt mountain. I added a soundtraxx "economi" sound decoder and it works great ( the decoder)...My question is:  on speed steps 1-2-3  the engine JERKS wildly...I have to get to speed step 4 and above for it to run smooth ( NO JERKING)..   HOW DO I CORRECT THIS..?...Thanks in advance....TONY

What is the location of PIN #1 on the 8 pin socket on the board in the tender of a 4-8-2 lt  Mtn, Part # 81601.  Most boards have it marked, this one doesn't.. Thanks in advance...breezy8

Thanks guys...I was afraid you would say that. I have the diagram, just thought I might miss something...Thanks again...breezy8

Are there instructions on how to disassemble a SPECTRUM USRA LIGHT MOUNTAIN 4-8-2, Item #81601