Stupid mistake

Yes the only thing between battery and ammeter is the fuse link, out in the engine bay

Free factory shop manuals..........

http://www.mymopar.com/index.php?pid=31

It would be REALLY wise now that you have it apart to read and heed this:

http://www.madelectrical.com/electricaltech/amp-gauges.shtml

Take the bulkhead connector apart and inspect, and give the ammeter a really good look as well.