Athearn Wiring Question

[Ken Portner]

I just wired an Athearn RTR for DCC using instructions I found on TCS Decoders site.

The instruction said to solder the decoder's black wire to the frame as a ground. It isn't connected to the left wheel pickup like I'm used to .

It's working so I'm not complaining. But I am curious. Why doesn't the black wire need to be connected to the left wheels? Thanks.

 

[Dave S]

There is already an electrical connection between the wheels and the frame. Some engines use the frame as a conductor.

 

[CBCNSfan]

If you are installing a DCC decoder in an Athearn, un-ground the motor from the frame.
Cheers
Willis