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Atlas C420 Install

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sandy.hadsell:
I think I am ready to give my first install a try. I have an Atlas C420, and a pair of C424's that have all run well on DC. Popped the top on the c420 and I see a square 8 pin. Does anyone have any experience with this type of install they would like to share? I wish I had a user manual for these engines, but bought them at a swap meet a year ago. Any advice is appreciated.

G8B4Life:
There wouldn't be a user manual as such for them that I know of, well not for plain DC versions but the parts diagrams are available: https://shop.atlasrr.com/t-partsdiagrams.aspx

I can't help much with anything specific on the install side of things as I've never done an Atlas but most on here would do a hardware which would mean getting rid of the factory circuit boards and plugs to make more room and soldering all the wires to the 9 pin harness that comes with the LM. If that doesn't strike your fancy, which it isn't for everyone, at worst you'll need a 8 to 9 pin adapter harness. These are fairly well plentiful and come in different lengths. What you would need to do is determine where the LM would best sit inside the loco so you can get the shell back on properly to workout how long an adapter harness you'd need. If you wish to add sound then it's highly likely you'd need to hardware to be able to able to get everything to fit in.

- Tim

sandy.hadsell:
Thanks, The links to the parts diagrams are helpful.

ON28:
I retained the factory 8-pin plug on my Atlas GP-7 install just for convenience, it has worked well. As with DCC layout wiring, there's something to be said for non-solder connections, for easier maintenance.

KPack:
If you're going to retain the factory board and wiring, simply remove the plug that is in the 8-pin plug currently.  Then use an 8-pin to 9-pin harness adapter and plug the LM-3S into it. 

Otherwise, remove all the factory board and solder up all the wiring to a 9-pin plug.  My preference is always to ditch the factory boards, but I'm also a glutton for punishment.  It can be done both ways.

-Kevin

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