RailPro > RailPro Specific Help & Discussion

LM-2S with a K-A, but no Bridge Rectifier??

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CPRail:
Hey Gang,

The old man was doing an install a couple of days ago while I was busy trouble shooting one of his other locos. I was vaguely following his actions as it was his first ever hard wire and he was installing a K-A.

Oddly enough he was using an LM-2S, not a 3S and hooked up the K-A as you do with a 3S (i.e. without a bridge rectifier and across the 9 & 6 pin plugs). It worked fine!

Before he rips it apart to install the bridge rectifier, is there something that has changed so you don't need a bridge rectifier?

William Brillinger:
When you say, "It Works" - do you mean the the KA is functioning properly?

That yellow wire is labelled as an Input on the LM-2S wiring diagram.

I don't know if Tim made any actual changes when it was repurposed and labelled "negative" for the LM-3S. You might want to contact him directly to find out.

KPack:
I'd love to get some clarification on this as well.  I'm getting ready to do an install and just realized I'm out of bridge rectifiers.  And I'm using up my last LM-2S, so I would love to just hook up the KA without having to wire in an extra component.

CPRail:
I honestly can't remember if it did all the K-A magic once off the rails, but I'll confirm tonight and let you gents know tomorrow.

drisdon:
Kpack
Bill has the keep alives and bridge rectifiers in stock, all with free shipping!  :) 

I too will soon, once the painting and decaling is complete, be doing LM-3S installs with keep alives in three Genesis GP38-2's (CSX each in a different paint scheme), one Genesis GP40-2 (CSX) this one gets a LM-2S, one Atlas B23-7 (CSX Family Lines), and one Atlas GP40 (CSX B&O Painted).

Dan Risdon

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