I installed the sound card in my Heisler after resetting all the CV's to factory defaults as required by the instructions. The sound card worked fine, but the locomotive jittered or vibrated at low speed settings. I tried everything I could think of. I called Bachmann and they said to send the engine to them for repair/replacement.

As I was packing the engine I noticed that there were several CV's listed on the cover page of the quick start guide that had to be manually reset to factory defaults. I reset them to the values listed which were different in some cases than the factory defaults that were listed on the spec sheet and the engine ran fine.

I don't know if I was just unlucky or dumb, but if anyone else has experienced this problem, resetting those odd CV's does the trick. I just wish Bachmann had told me.

I have a Climax that I bought about 6 mos. ago. It stalls out on a small grade(1-2%). I checked the drive and everything seems to be connected. However, I noticed that I can turn the wheels on the rear truck and the drive shaft will turn. I can't do this with the front truck. I can lift the rear tuck and the front truck wheels will still turn. If I lift the front truck the rear wheels will not turn. They stall. Any ideas why this loco won't climb grades?