Good place to find wiring schematics???
"We" have a 72 shop manual (and others) you can download right here:
http://www.forabodiesonly.com/mopar/showthread.php?t=132309&highlight=manual,+download
and, as mentioned, "My Mopar"
Click the "wiring, electrical" and go from there
http://www.mymopar.com/index.php?pid=31
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