I discovered this a while ago but never "ran it to ground".....It seams that the 68 Z cars WITH AC have only one of the horn type relays mounted under the hood on the drivers side fender (which is of course the horn relay). All of the other assembly plants put two under the hood. The additional one is for the AC and is generally seen on the passenger fender in approximately the same position as the horn relay.
Where is the AC relay in a Fremont car? Or what is the proper location for a Fremont car?