Where do you have the GPS plug wired into, directly to the battery terminals? Assuming the 300 is the same as the 250/500, the OEM wiring goes into the Main fuse right after the battery. If that fuse blows, nothing on the bike will have power. If the GPS plug is wired directly to the battery terminals, it will still have power though.
But I assume the Tender plug is wired directly to the battery terminals as well. The fact that the Tender indicated a battery issue, along with the fact that the battery wasn't powering the bike, seems to point to the battery actually being bad.
Like ForceofWill said, it could also be a loose connection somewhere important.
__________________________________________________
*** Unregistered, I'm not your mom and I'm not paying for your parts, so do whatever you want with your own bike. ***
|