Decoder question

[kbell1958]

A friend just installed an NCE decoder in my Bachmann SD40-2.  Now the locomotive runs backwards when I put it in forward and forward when I put it in reverse.  The lights are OK, though.  Which wires do I need to reverse?  Keith

[SteamGene]

You should be able to just adjust the correct CV(s)
Gene

[kbell1958]

Which ones might those be?  Keith

[WoundedBear]

Are you sure you have the orange wire of the decoder in the #1 position? It's easy to install an 8 pin plug backwards.

Sid

[kbell1958]

The decoder is actually a replacement board and you solder the 6 wires from the locomotive onto it.  There's a black and red one from the front truck, another black and another red one from the rear truck, and a green one and an orange one.  I think those are from the motor.  I'll try reversing them and seeing if that does the trick.  Thanks for your suggestions!
Keith