It's the pin out
The problem from, my perspective from reading your thread entries, is in the connection to the wiring harness of the Can AM. Your going to have to buy a connector (and pins) that matches the one you're trying to connect to. Make sure you understand the pin out for that connector from the Spyder and match it to the power and ground wires of the Garmin harness (use multi-meter to back it up). The another solution is to use posi-taps on switched and ground wires in the harness, don't recommend that though with the Can Am. Another solution is to use a fuse block with a ACC trigger wire so it uses switch power (more complicated install).
If I have this wrong you need to post pictures of the connection and mount so someone has a clearer perspective.
PS be sure to buy a crimper that matches the pins for the connector. Possible sources for terminals and crimper:
http://www.easternbeaver.com/
http://cycleterminal.com/
Read their crimping tutorials for best results. If you also buy pin removal tool you can remove the pins without tearing up connectors or pins and re-pin the connector.
This is what I did for my motorcycle, Ann's Can Am came with the Garmin 660. Mine works flawlessly. If I can do it, so can you.
Hope this helps.
I purchased the Garmin No. 010-11270-03 Mount from Amazon and IT DOES NOT WORK WITH MY Garmin 660.
The problem from, my perspective from reading your thread entries, is in the connection to the wiring harness of the Can AM. Your going to have to buy a connector (and pins) that matches the one you're trying to connect to. Make sure you understand the pin out for that connector from the Spyder and match it to the power and ground wires of the Garmin harness (use multi-meter to back it up). The another solution is to use posi-taps on switched and ground wires in the harness, don't recommend that though with the Can Am. Another solution is to use a fuse block with a ACC trigger wire so it uses switch power (more complicated install).
If I have this wrong you need to post pictures of the connection and mount so someone has a clearer perspective.
PS be sure to buy a crimper that matches the pins for the connector. Possible sources for terminals and crimper:
http://www.easternbeaver.com/
http://cycleterminal.com/
Read their crimping tutorials for best results. If you also buy pin removal tool you can remove the pins without tearing up connectors or pins and re-pin the connector.
This is what I did for my motorcycle, Ann's Can Am came with the Garmin 660. Mine works flawlessly. If I can do it, so can you.

Hope this helps.