Hi,
Welcome to the forum.
Somebody on here will be able to help you I would think. However, it's customary on your first post to introduce yourself with a few details about your Zed. And I doubt if it will be long before someone asks for a few pictures, as they seem to like them !
If you add your location, somebody near you may be willing to swap the Amps over and see if thats the issue. I suspect that water has got into the boot and drowned the Amp that lives next to the battery.