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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
its on the receiver/dryer up by the firewall. only two wires there, stick a jumper between them with the engine running, and my guess is, the compressor will engage. Don't leave it run too long that way, as it indicates the system is low on charge, and therefore, low on lubricant as well.....
i just had the same problem and what it was is my lower horn was shorting out and blowing the horn fuse, i disconnected the horn and replaced the fuse and it started working. if you suspect its a relay just pull the ac clutch relay and swap it with one of the other relays( pretty sure there all the same but match the numbers)
thats probably it then, crawl under the drivers side and look just behind the headlight and youll see two horns, disconnect one at a time to see which is bad. Replace fuse and youll compressor will kick on when you put the new fuse in