yo T,
When looking at the AC Compressor under hood from front bumper, the A/C clutch field coil is on front of compressor;
there is a wiring harness with two wires connected to the clutch
with engine off
cut the Gray (GY)/with White (W) striped wire in half; strip both sides a bit so that a weatherpak type connector (most use an Insulated Crimp-On Butt Connector) can be used to join these two cut wires to a new 2 wire section; when buying wire and connector, tell sales people that the circuit is protected by a 15 amp fuse and is in your Bronco (12v DC nominal)
then run a similar sized new 2 wire section back to drivers side in side cab via the clutch blank that is below the Master cylinder. Here is a pic; ensure a previous owner or shop did not attach anything to cab side; use a 1/8" bit for a pilot hole, then a larger size for the new 2 wire section;
when buying the new 2 wire section, get a grommet that will fit snug against the clutch blank hole as well as the 2 wire section, place it on the 2 wire section before hooking the wires up to the switch or the cut wires.
drill bit should be suitable size to fit grommet snug into clutch blank
at A/C clutch field coil, strip wires and hook up one from new wire to Gray/W wire, either side
and other new wire to other side of the cut gray/white
Inside cab install toggle switch
http://demandware.edgesuite.net/sits_pod26/dw/image/v2/AASR_PRD/on/demandware.static/Sites-radioshack-Site/Sites-master-catalog/default/v1419159620877/images/55050549_00.jpg?sw=350&sh=350&sm=fit
Since fuse for the circuit is 15 amp, get a 20 amp rated switch for about $12.00 @ radio shack
hook up both new wires to it
one wire on one terminal and other wire on remaining terminal
I'll post this for now and edit later.