when it rains it pours

you should do some reading over on the mad electrical web site. there is an article on how to bypass your ammeter to prevent issues, and how to make good connections that dont "fry things" http://www.madelectrical.com/electrical-tech.shtml

i believe if you go to the moparts website, they have links from the main page with tons of tech articles about wiring. http://www.moparts.org/Tech/Archive/elec.html
and there are some full wiring diagrams in pdf form that you can view/download on mymopar http://www.mymopar.com/index.php?pid=24

you really wont need to buy a whole wiring harness. learning how to make sure that your current connections are clean/well connected/efficiently routed will make it work like new.

good luck!