Bachmann DCC On Board GP40's (Older Models)

[Rocky1266]

Hello,

       I have a bunch of GP40's from the "Blue Box" Bachmann DCC On Board series that I have had for years but neglect to run them because when I try to run them on Digitrax, they will run erratic, as in jerky performance, odd speed differentials, stopping and starting, etc. Cleaned the wheels and contacts, still the same performance. I did some internet research and found that people are removing the capacitors from the motor that are attached between the motor contacts. I have had these things for centuries so I am not worried about voiding any warranties or anything so that is not an issue. Can someone please tell me, do I cut all 3 out and the 2 resistors running to the motor, or just the capacitors? Thanks... Also if anyone knows any websites I could go to for pictures that show what to cut, that would help to!

[richg]

Remove the capacitors. What looks like resistors are inductors that form a tuned circuit with the capacitors. With the capacitors out of the circuit, the inductors are a moot point. That is what I and many others do. I have seen this issue in many mrr forums the past two years.
You might get a good decoder with Back emf. The locos will run a lot better.

Do a Google search for decoder bemf. You will get all kinds of good info on this issue.

If you want more info, do a Google search for bachmann dcc capacitors.

Save the links that help you to share with others in the future.

Rich

[Doneldon]

Once you identify the decoders you want, check ebay.  They sometimes have just what you want at an attractive price.
     --D