Dancing ammeter

I checked all the grounds allready. I did a voltage drop test accross them and they tested good. I don't have another battery but may see if I can find one to borrow to test it with. When I rebuilt the wiring harness last year I replaced all the connectors on the harness and bulkhead connector. It would surprise me if that is a problem but it's an easy test so I'll have a look tomorrow. I hate to bypass the ammeter since it's the only thing that shows me if it's actually charging. I heard a while back that somebody makes a voltmeter that goes in the place of the stock ammeter so it eliminates the big power requirement being transfered through the bulkhead but I don't remember who sold them. If anybody knows please post it. I'd appreciate it.

Thanks for the reply Red.