Help - Eureka D50 Wiring

  c3526blue Deputy Commissioner

Location: in the cuckoos nest
Good evening all,

I am seeking advice from someone (anyone) regarding the connection between the engine and tender on a Eureka D50 Class H0 model.

Unfortunately it appears the connections from the tender wiring to the female JST connector are only crimped.  This causes problems over time as the wire used is very inflexible.  Movement between the loco and tender puts strain on the crimped connection, to the point that individual strands start to break or pull out, putting even more strain on the remaining strands.  I have had separation of the wire completely from some terminals.  On my model of 5063 with sound this has caused intermittent and inexplicable behaviour on DCC.  It became so bad recently that after some unexplained trauma all 7 wires have separated from the connector.  The Chinese have kindly helped (sic) the situation by using only one colour (black) for all 7 wires.  

My dilemma now is which wire goes in which terminal.  Accordingly I am hopeful that somebody may have a diagram or details that clearly identify which wire from the PCB in the tender goes to which wire in the connector.  If so can someone assist by PMing me with the advice, or even better provide a link or advice in this thread on the wiring details.  I can do it myself by getting access to another D50 tender for comparison, but rather than reinventing the wheel, why not seek some assistance.

At this stage I have done some research on JST connectors.  The item in question appears to be a JST-SH 7 pin Female Connector.  These can be bought online with 100 mm long wires already connected (Option 1) or as a kit of components to manufacture your own connector (Option 2).  

Data Sheet for JST-SH Connectors

           eSH.pdf (

eBay site for pre-wired connectors
           5/10/20 PCS 7 Pin JST SH1.0 Cable Connector Plug 100mm 28AWG eBay

eBay Site for Connector kits
           JST-SH Micro Mini 1.0mm 7-Pin Female Connector Male Top Header & Crimp x 30 SETS eBay

Ray Pilgrim has done some work on rewiring a Eureka D50 and here is a link to his blog where he has a table describing the standard connector wiring.  However the article does not show the connections from the PCB.
           Eureka D50 Titan Wiring.pdf - Google Drive

In preparation for the exercise I have disassembled the connector from 5063 into its 8 component parts. There is one white plastic housing and seven crimp connectors.  It was a bit awkward to disassemble due to the construction of the housing and the crimp pieces which are designed for easy insertion and locking, but not for easy disassembly.  I am going to try and solder the wires to the crimp connectors and then insert them into the housing.  They must go into the correct locations so as to avoid unnecessary and frustrating rework, or even damage to the decoder/loco.

It is intended to make a photo show and essay of the repair process to assist others who may have also encountered this problem.

Any advice or comments on this issue and my proposal would be most welcome.

Happy electrickery,


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  miktrain Deputy Commissioner

Location: Adelaide SA

I know nothing about the D50 as it is the wrong prototype for me.
Some facts,

The problem you have is NOT due to the crimp unless it was of very poor quality as a good crimp will out perform a good solder joint every time.

It will be very difficult to solder the wires properly and get them back into the plug.

If you get it soldered they will probably break much quicker as the solder creep will make the wires stiffer at the join.

If I was doing this I would buy the made up crimped plug and wires as a they are very cheap.
Have a look here

or search "Eureka D50 Wiring" which will link to that page, there are several photos by someone that was playing with the lighting, there is a photo of the board in the back of the loco showing motor + and - as the two wires on one side another shows the tender but it is difficult to tell where the various wires go.

Contact the author about the wiring, I'm sure he will help you.


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