starting to sound to me that your alternator is not charging as HotrodLincoln suggested. The amp gauge will not drain the battery, it merely monitors the flow of electricity and the fact that it does not indicate anything tells you that you have a problem with the charging system.

1953 Chevrolet 3600
Fried Green T'mater (Vern)
In the Stovebolt Gallery
Caution: Political Statement
Man who runs in front of car gets tired, man who runs behind car gets exhausted.