Try classicparts.com . they sell diagrams. i have a 79 also
I was in need of a wire diagram for a 1979 gmc k1500 pickup as we are trying to restore it ourselves . so i couldnt get answers via the internet i went old school and went to the library and copied it out of a chilton. plain and simple . people ahve gotten lazy and forget how to do things the old fashioned way before we all had internet .
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