I believe I found the Green/Brown wire coming from Relay#1 on the picture.

Can anyone point me in the right direction as to exactly where I can find the Red/Brown wire to complete the Auxiliary Fan Modification, tying the fan to the A/C?

I have attached a picture of the engine bay for a point of reference. Thank you.

 

The red/brown wire can be found at the relay bank by the RH bonnet latch. The relay with the green base is the compressor clutch relay. you do have to insert a relay along with the additional wiring, or there are backfeed problems between the circuits. That means a wire has to run from the LH relay bank, all the way around to the RH bonnet latch.

This modification works wonders for the air conditioning.

Good luck!