Issue with Bachmann Decoder

I bought a Bachmann Decoder to put in a DCC-Ready Athearn AC4400. After I installed the decoder and put the engine on the track, immediately when the track had power, the engine started running on its own. I couldn’t control it or program it. Has anybody had this problem? Did I do something wrong or is it a faulty decoder?

did you remove the jumper plug from the 9 pin harness?

You bought a Bachmann decoder?

Sure sounds like the 9pin jumper board wasnt removed.

David B

That was it, thanks. I’m a newbie with DCC, but yeah I know that Bachmann’s not exactly the best. But I thought, what the heck. Never again, though. The stupid thing started smoking after putting power to the tracks. Thanks again, though.

Well…atleast you didnt smoke a good decoder.

I am pretty sure in the instructions that came with the loco, it does mention removing the jumper board.

David B

Primarily because of the jumper being left in place. Been there and done that.

thanks guys