ckjeep Posted March 31, 2014 Share Posted March 31, 2014 the horn on my comanche doesnt work. when you press it you can hear the relay click. the horn is in place but doesnt work other than hearing the relay. any ideas on what to check? thanks Link to comment Share on other sites More sharing options...
MJRemi Posted March 31, 2014 Share Posted March 31, 2014 Did it work before and then stopped? Is it a 2 spoke or 3 spoke wheel? Under the left headlight assembly is your horn and the wires can get corroded or loose. Check the connections and be sure the horn ground is also in good shape. Link to comment Share on other sites More sharing options...
gogmorgo Posted March 31, 2014 Share Posted March 31, 2014 There could actually be two horns, one on the left below the headlight, and one on the right. My '91 only had one horn, but it was on the passenger side. If you look straight up from under the truck towards the headlight, you should be able to see the horn. Looks like a snail shell. There may be a rubber/plastic trim piece (part of the fender liner I think?) in the way, but it'll pull backwards out of the way. Just remember to put it back. Check both sides to see if you've got one horn or two. As MJRemi says, most likely there's a bad connection somewhere. The horn grounds itself through the mount, so make sure it's bolted down tightly to clean bare metal. According to my wiring diagrams, there's a connector in the horn circuit somewhere (E2) but I've never looked for it. It's another possible corrosion point. It's also possible that moisture got into the horn itself and/or the horn simply doesn't work. To test the horn, unplug the connector from the horn itself and run a jumper wire from positive on the battery to where the connector goes. The horn should sound when power's put to it. If it doesn't, replace it. You can pick one up real cheap off of absolutely any car at a wrecker, although some horns have two terminals — one for power and the other for ground. Avoid testing horns late at night in a populated area... because reasons. While you've got the connector off, you may as well stuff a testlight probe into the end of it and check to see you get power when the horn button's pressed. Also, a cheap and easy horn upgrade if you've only got a single horn: Whether or not you've got a second horn, the wiring should be there for it. Both connectors are identical, and will be in more or less the same area on opposite sides of the truck. Use a testlight and a helper on the horn button to make sure you've got a horn connector (there are similar connectors for other things). Pick up a second horn, find some clean, bare metal to bolt it down, and plug it in. Woila, dual horns. It's typically recommended to point the open end downwards so it can drain, although I'd turn it as far as I can to the point where the opening points horizontally without it pointing upwards so I get maximum drainage around the curl. For best results, use a horn with a different note than the first. I've wired in an extra horn on one side for a three note chord. :thumbsup: Link to comment Share on other sites More sharing options...
ckjeep Posted March 31, 2014 Author Share Posted March 31, 2014 i have only found one horn on passenger side. i don't know how long since the horn worked. i got the truck about 4 months ago and it has never worked. and it is the 2 spoke steering wheel Link to comment Share on other sites More sharing options...
ckjeep Posted March 31, 2014 Author Share Posted March 31, 2014 yea i am going to test the horn itself today. since i can hear the relay click then that would most likely be a horn or ground? i will clean the mount today and check the horn and let yall know.thanks Link to comment Share on other sites More sharing options...
gogmorgo Posted March 31, 2014 Share Posted March 31, 2014 There's no way to know for certain without testing. If the relay's clicking, that just means the issue lies somewhere in the horn part of the circuit and the horn button part is fine. I don't think it's all that likely your issue is a bad ground given the way it mounts, but you never know. Use a test light to make sure the horn connector gets power when the horn button is pressed. If you have power, then test the horn with the jumper wire. If it doesn't sound it's probably shot, but it can't hurt to unbolt it, clean up the mounting point, and bolt it back in to see if that helps. Alternatively you could run another jumper wire from the horn bracket to known good ground. If you don't get power to the horn connector when the button is pressed though, then you've got to start tracing the circuit back until you find out what's wrong. But you may as well test the horn anyhow... you never know, there could be more than one issue. Case in point, when I got my MJ, the horn didn't work. The relay tested bad, the horn connector was corroded, and the slip disk in the column was straight up missing. Given that your relay is clicking, it and the horn button on the steering column are fine, so don't go tearing into it. Link to comment Share on other sites More sharing options...
Eagle Posted March 31, 2014 Share Posted March 31, 2014 Personally I do think it's probably a bad ground at the horn, but that's only because that was the problem with the horn on my '88 MJ. The relay clicks, so you're good to that point. Next test -- get a helper and a test light, unplug the power lead from the horn and probe with a test light, have your helper push the horn button and verify that you have power to the horn. If you get power at the horn, the problem is the horn, or the ground. Run a supplemental ground. If that doesn't fix it, you may need a horn. Link to comment Share on other sites More sharing options...
ckjeep Posted March 31, 2014 Author Share Posted March 31, 2014 found the other horn. turns out both horns are bad. tested them and they wouldnt work even straight wired.pulled the horn off my yj and put it on there and everything works.thanks for the help.this is the first time i have seen 2 horns bad at the same time. Link to comment Share on other sites More sharing options...
gogmorgo Posted March 31, 2014 Share Posted March 31, 2014 Awesome! If it's seen much offroad action (mud, water, dust) or even heavy weather, or someone a little over-zealous with a pressure-washer could have buggered them. More likely, it's 26 years old, one went out and then the other went out. Link to comment Share on other sites More sharing options...
ckjeep Posted April 1, 2014 Author Share Posted April 1, 2014 didnt see any mud or dirt in them but the guy i got it from did tell me he pressure washed the truck trying to get the flaking clear coat off so maybe he drowned them.anyway the horn works so i am happy Link to comment Share on other sites More sharing options...
Jeep Driver Posted April 1, 2014 Share Posted April 1, 2014 10 posts and not one horny joke. :brows: Link to comment Share on other sites More sharing options...
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