Ebay is by far the best place to nail down a set of factory manuals...i went a little overboard though...i so far have 72 thru 89 complete...and i think i am only missing 96....can't hurt to have the info!!! I got my 86 set thru ebay for around 30 dollars which included the wiring diagrams...drivability...service...and unit repair. You can type in 1986 under automotive and see what pops up!!!
AZBLAZER
1979 K5
1976 K5 Chalet
1972 K10 Suburban