Bad Day...Smoked something....2nd verse

You need to find the short. Get a test light, unhook the battery NEG terminal and hook the test light up. Go round and make sure EVERYthing is shut off, including dome, trunk, etc lights

A drain will light the lamp. Sometimes, when trying to find heavy shorts, a headlight works well.

If you can't find it (disconnecting "stuff" and removing fuses) try disconnecting the alternator

And, it COULD be the ammeter. The two studs should show "open" to ground when disconnected.