78 was the first year this option was ava....
79...the next year the wiring changed quite a bit...for the better in my opinion...
There is a molded plug that comes out of the firewall....then the harness runs the lentgh of the frame to the tailgate....when i had my fuel tank out 2 years back doing my TBI swap i remember the harness being extremely brittle...ie: jacket falling off the wire itself.....and this makes for our friend resistance to grow up and be really happy....lol. Most of the terminals outside are all series 56 delphi units...par for the course from the mid sixties up...
If i had a old harness i could build a new one using the old one as a template...but both the spare K5's i have out back have nothing left as far as wiring for the tailgate. But basically in a nutshell i really recommend building a new harness so you won't have to complain about the slow rear window....
DW
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