5KTQ Cruise Control-Help

[mark.e.woodland at gsk.com]

I got Max ('87 5KTQ-256K miles) back together this weekend, now with
Bilsteins and H&R springs.
I'm getting it ready to start commuting 1000 miles a week and need to get
the cruise control sorted out..
but I can't lay hands on my (Bentley) electrical manual.
I've started to test the system per the sequence in the Bentley mechanical
manual, and am blowing fuses.
The fuse (#12) blows when the cruise control is switched to the "on"
position, even with the cruise control module disconnected.
The circuit traces to the Blue wire w/red stripe entering the control unit.
Two wires go to the terminal,
one from the control switch, and one going out to a "test connector". The
circuit shows continuity to ground,
so is either shorted to ground, or there is another element to the circuit
that I don't know about. Any BTDTs?
If anyone has a current track/schematic for that, I would appreciate the
assisstance.
If there are no other connections, then the switch is shorted internally,
or one of the wires has shorted.

Plan"B": I'm not beneath hacking into the system and adding manual switches
to replace flaky electricals.
If anyone would be so kind as to give me a breakdown of function vs. color
code at the switch, I would just add  on/off and momentary
switches to get the ON and SET functions working. (Rather than replace the
dreaded MultiFunction switch)

P.S. The H&Rs dropped the rear enough to rub the tires (on 16"BBS wheels,
with a bit too much offset).
I flared the rear fenders with a slide hammer/right angle attachment.  It
looks almost factory, and didn't pull off any paint
(that wasn't loose already  ;  )   If I ever go "Digital", I'll post the
pictures.
Many thanks in advance,
Mark Woodland