Hello:
I enjoyed your post. I too have V8 Johns Cars conversion and have had it under the for about 10 years on my 84 XJ6. Recently, a Stereo guy both cut and lost the wrong wires for the air conditioning circuit. All of the air conditioning harness is attached, except the two brown wires that power "on" the unit, and power "off" I believe. I connected a battery wire to one of the connectors and the AC powered on, but stayed on even when the car was turned off.
Would you happen to have an idea about how exactly the two brown wires connect to? You mentioned you would be willing to share info about your wiring, diagrams, etc, etc...
Any help would be greatly appreciated, sounds like you put a lot of work into upgrading your electrical system.
Thanks Again,
TIM