Sorry, I also only have the scanned microfiche, so searching on text is not available. But the index is useable to some extent.
In the contents tab, it gives fiche 3 for electrical, along with alternator, battery etc.
Cruise control is in section 27-120. About 8pages of a flow diagram, with some pin checks, etc.
Here is a useful site for some diagnostics-
http://www.sjmautotechnik.com/trouble_shooting/ecufv8.htmlThe link takes you straight to the V8 stuff. US market, mainly. But there's useful detail in there.
Whine.
There was a comment in my previous post about a suppressor mounted under one of the chassis rails, near the alternator. On my vehicles, this was disconnected every time. Probably because the wiring is a bit cramped, or forgetfulness after swapping an alternator.
