strange decoder issues

[pdlethbridge]

After installing a decoder in my mountain, I started having issues with it. The back light would work and it would back up okay, but as soon as I hit forward, it would take off at full speed and the only way to stop it was to turn the power off. I tried it again and the same thing happened. I switched decoders and the problem went away. I suspect a bad decoder. I have installed about a dozen decoders and thats the first time that has happened. Strange!

[Yampa Bob]

This page might help, scroll down to "Speed Control".
http://www.dccwiki.com/DCC_Power#Polarity_doesn.27t_control_direction

[pdlethbridge]

As I stated the problem went away as soon as I installed a different decoder. So the decoder was bad not my installation techniques, although they could improve greatly.

[Yampa Bob]

The page just tells what might have been the problem with the bad decoder, as a matter of interest only.

[pdlethbridge]

          Sorry, didn't catch it.