It will be in the 1972 Buick Chassis Manual. You should get one if you are serious about working on the car, and keeping it. They are available in reprint and also on CD ROM. In the meantime, if you post your e-mail (or PM me), I'll send it to you in an E-mail.
Thanks Larry, J R Wills is emailing the wiring diagram. I would like to get a shop manual, are they available thru GM or someone else? Marc
TA Performance has reproductions, www.taperformance.com They are available on E-Bay also and if you put "1972 Buick Chassis Manual" into Google, you will get the sites that sell them on CD ROM.