Violet Wire on 21PIN/21MTC To 8PIN/NEM652 Harness

[Hawks Rule]

Hello All,

I have a Bowser Alco C630M DCC Ready diesel with an 8 pin adapter.

I purchased a 21 pin to 8 pin Harness, since I wanted to use a Loksound 21 pin Sound Decoder

So far so good, eveything works fine.

I even hooked up the speaker and the sound is very good.

My question is, the adapter has a Violet wire that is not connected to the 8 pin portion.

I know that it is an auxillary wire for other functions, ditch lights etc.

How do I connect this wire, if I want to add another function?

Here is a Photo of the  Harness:

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[tstage]

Hawk,

What function do you want to add?  If it's lighting you'll need to tap into the common (i.e. the pad that the blue wire is connected to) or another common soldering pad.  Usually there is more than one common on a decoder board.

So the harness for the Lok 5 uses white for the speaker???  That's confusing.   White is usually the (+) for F0F headlight and brown wires are speakers.  I don't see any brown wires

And it looks like you also have a green AUX wire.  That gives you two options for lighting or other functions.

Tom

[Hawks Rule]

tstage

Hawk,

What function do you want to add?  If it's lighting you'll need to tap into the common (i.e. the pad that the blue wire is connected to) or another common soldering pad.  Usually there is more than one common on a decoder board.

So the harness for the Lok 5 uses white for the speaker???  That's confusing.   White is usually the (+) for F0F headlight and brown wires are speakers.  I don't see any brown wires

And it looks like you also have a green AUX wire.  That gives you two options for lighting or other functions.

Tom

Hi Tom,

The harness is made by LaisDcc.

Here is a photo of the schematic:

Function: Use for the customers who want to use a 21MTC sound or Non-sound decoder for a build-in NEM652 8Pin Locomotive

 

[Hawks Rule]

The green wire goes from the 21 pin to the 8 pin. 

There are 3 white wires, 1 is the FWD light that goes from the 21 pin to the 8 pin.

The other 2 white wires, not connected, as you can see by the picture are for the speakers + -

[Hawks Rule]

Perhaps this photo might clarify things:

[Hawks Rule]

Here is another photo from a different angle:

You can see 2 unconnected white wires for speaker connection.

[tstage]

Interesting.  It still makes it confusing using multiple white wires (and right NEXT to each other ).  But...as long as you can keep it straight.  The schematic is also a mirror image of the photos.  Maybe the photo is reversed?

So, it looks like there is only one (-) common pad on the above board.  You can either solder a 2nd common wire to that...or solder one directly onto the Lok5 decoder.

Here's the schematic showing where the other "U+" commons are located on the 8-pin versions:

The downside to the latter is that you would need to unsolder the common from the Lok5 in order to completely remove the decoder from your locomotive.  Not a big deal but a consideration, nonetheless.

Tom

[Hawks Rule]

tstage

Interesting.  It still makes it confusing using multiple white wires (and right NEXT to each other ).  But...as long as you can keep it straight.  The schematic is also a mirror image of the photos.  Maybe the photo is reversed?

So, it looks like there is only one (-) common pad on the above board.  You can either solder a 2nd common wire to that...or solder one directly onto the Lok5 decoder.

Here's the schematic showing where the other "U+" commons are located on the 8-pin versions:

The downside to the latter is that you would need to unsolder the common from the Lok5 in order to completely remove the decoder from your locomotive.  Not a big deal but a consideration, nonetheless.

Tom

 

Many Thanks!

Looks like it should work out ok.

I am looking to add ditch lights.

[tstage]

Sorry, Hawk.  I just realized that I should have posted the Lok5 21-pin decoder schematic: (Click to enlarge)

It does look like it's in the same location as the 8-pin version though...

Tom