Heh... that's a very general question!
There's lots of reading material for you here on the forums, but if you have something that's not working right or at all (I assume with the electrical system, based on the thread title) you should ask more specific questions.
If you send me a PM I can email you a scanned 1975 owner's manual for a standard-width Argosy. The general information about how '70s Airstreams work would apply.
Il Carriaggio — 1975 Argosy 24 | Il Progetto — 1976 Argosy 28 Center Bath | WBCCI# 15566
He has all of the virtues I dislike and none of the vices I admire. — Sir Winston Churchill