I have an air horn and the stock horn in my 1995 jeep wrangler and both have been disabled. as far as i know they are in working order though. how can i reconect one of them to the system? i cant seem to find where they have been disabled.

how to fix a horn on the work bench
or how to diagnose a dead horn on car.?

my guess, #2
TJ car.
here is the list;

1. do not fiddle wires near horn sitting at steering wheel unless you defeat air bags first, per the BOOK "FSM" or u may die.
2. check the fuses first.
3. scan the PCM next, got DTC errors ?
4. read the FSM yet?

here, TJ
http://colorado4wheel.com/manuals/Jeep/TJ/

the pdf.
chapter 8H> horn
and the schematic there 8w?
8w41-3 see that relay, does it click with button pushed?
key on?
need more ask.
is ground good to horn
did you hot wire horn to see if its really good first
connector pulled?

my horn problem seems related to a bad horn connection, and a bad clockspring, (shorting out and energizing horn relay, causing battery to drain dead over weeks).

you will need to remove air bag from steering wheel wire for horn is behind it

Check the horn ground. By pass the relay and feed the horn at the relay terminal. Could be a bad wire from the relay to the horn.

First, run a direct hotwire to the horn. If it fails to work, replace it. if it does work, check that the relay is working. If both horn and relay are good, likely the horn connection inside the steering wheel has gone bad. That requires removing the horn pad from the wheel and possibly going deeper into the top of the wheel to find the problem. (most often you won't need to go that far though)

you have a short in the ign. circut

Near the gas pedal is a linkage that diverts the air from defrost to front to low by your feet. Sometimes this linkage comes un-done. This could be fixed by holding it in place with a wire-tie. Let me know what you find.

1995 Jeep Wrangler Car Stereo Radio Wiring Diagram.
Car Radio Constant 12V+ Wire: Red/White
Car Radio Switched 12V+ Wire: Purple/White
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Blue/Red
Car Radio Dimmer Wire: Red/Black
Car Radio Antenna Trigger Wire: N/A
Car Radio Amp Trigger Wire: N/A
Front Speakers Size: 4′ x 6′
Front Speakers Location: Dash
Left Front Speaker Wire (+): Gray
Left Front Speaker Wire (-): Yellow
Right Front Speaker Wire (+): White/Red
Right Front Speaker Wire (-): Brown/Red
Rear Speakers Size: 4′
Rear Speakers Location: Rear Roof
Left Rear Speaker Wire (+): Gray/White
Left Rear Speaker Wire (-): Brown/White
Right Rear Speaker Wire (+): White/Black
Right Rear Speaker Wire (-): Brown

You should really have the service manual at hand; they will contain color coding of all of the wiring. Either Haynes or Chilton will have all the electrical diagrams and the most serivce work you can do at home on the mechanical stuff. They cost between 20-30 dollars US and can be had at auto parts stores. 

Many horns are not directly controlled by the horn button but by a relay on which the horn button works. 

check all bat. conn. especially the grounds. give it a good t-up plugs cap rotor wires air& fuel filters the next time stalls out hold gas pedal to floor don't pump it.