Doc decoder fitting 170

[Alan241]

Hi I’m new to Dcc and though I would try fitting a decoder to a Bachman 170.

The decoder is a Gaugemaster Dcc 27

I removed the 8 pin connector.

open up the 170.

I lifted and cut off the pcb board ( possible mistake)

I connected grey,black, red, orange wires ( just twisted wires )

and tested it .

the controller ( Z21 roco ) shows a short when I connect red or black.

Train works fine DC

was my error removing the pcb board?
 

[newbryford]

10 minutes ago, Alan241 said:

Hi I’m new to Dcc and though I would try fitting a decoder to a Bachman 170.

The decoder is a Gaugemaster Dcc 27

I removed the 8 pin connector.

open up the 170.

I lifted and cut off the pcb board ( possible mistake)

I connected grey,black, red, orange wires ( just twisted wires )

and tested it .

the controller ( Z21 roco ) shows a short when I connect red or black.

Train works fine DC

was my error removing the pcb board?
 

 

No error in removing the circuit board.

I've fitted 3 or 4 170s and a number of 158s and Voyagers that essentially share the same chassis/board/wiring design.

 

The important connections are remembered with a simple rhyme.

Red and black to the track.

Orange and grey the other way (to the motor)

And it looks like you've done that.

 

As there is a 21MTC connector on the decoder - can you test it in a 21 pin loco?

 

Cheers,

Mick

Edited December 8, 2019 by newbryford

[SRman]

I think it looks correct too but there are usually two sets of wires from the pickups (one pair for each bogie). I can't see where the other end's wires are going, so I wonder if they are still connected but on opposite polarity to the ones we can see.