Disconnect the wire from the big starter terminal to the ammeter to isolate the rest of the electrical system from the starter and see if the battery keeps a charge overnight. Once that wire is disconnected, an ice pick type test light connected from the battery cable terminal to the ammeter wire SHOULD NOT light up unless some kind of accessory is turned on, or there's a short that's causing a constant battery drain.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!