alternator going out?

Start here:

http://www.madelectrical.com/

http://www.madelectrical.com/electrical-tech.shtml

In particular read this:

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

The problems with "all our old girls" is several

First, OEM Mopar alternators simply do not put out much amperage at low shaft speeds as compared to some newer designs.

Second, you have a few problems with the factory wiring setup, (the last link)

The fact that Mopar used a "full current" ammeter means that ALL heavy current has to go through a lot of wiring. This can lead to "voltage drop."

Second, several high current connectors go THROUGH THE FIREWALL (bulkhead) connector. These connections were really NEVER adequate for high current, and now that people tend to install larger alternators, larger wattage headlights, bigger stereos, etc, AND they have deteriorated over the years (some of us FORGET how OLD these cars are!!) means that all of this stuff adds up

Also read the link at Mad about headlight relays.

The general idea is to do several things:

One way is to convert the ammeter to either an "external shunt" type or replace it with a voltmeter.

You can bypass the ammeter which reduces the load on the bulkhead connector.

You can install headlight relays which can draw power from the starter relay stud under the hood, thus relieving more strain on the bulkhead connector

Do a search here on things like alternator, "voltage drop", alternator, "ammeter bypass", etc.