Betting that's the converter cable is the problem J. I'll betcha Greg Walters can help you with that pin layout. I'd email/PM him if he doesn't happen to see this.

If you've got access to cable making supplies, you could prolly gen up a test cable to bypass the adapter if you're of a mind to trouble shoot it further.

Radio shack has the male/female pin ends for pretty dang cheap and with a litte tedious close up work, you can make a bypass cable pretty easily. I've done it before to test out a Garmin cable.

Wannabe...