Hi,
Running an ammeter is dangerous if it's not hooked up correctly.It must be in series with the main battery supply.It also must have a #8 [#10 will do] gauge wire to the battery and then fuse block.
You should check and see that ALL power goes through the ammeter. [Disconnect it and see if any other circuits work]
If it's wired in parrallel to the battery , it will act as a shunt and backfeed current to the battery.
Good luck,
Perry.
