1978 Austin Allegro horn problems. Horn itself is fine.
Hi there, I have a 1978 Austin Allegro and the horn is causing us endless trouble! Initally the horn would just make a "clunk" sound. We tested the connections with a multimeter and all good there. Took the horn out, tapped it with a hammer, and tested with a jumper kit -- all good there. But put the two together (ie the horn back in the car) and it goes back to making the "clunk" sound. We were going to try and bypass the relay, but can't tell which wire, if any, going into the relay is from the horn. In fact, the horn wire seems to go in somewhere under the headlights at the front of the car, but we simply can't get a vantage point that allows us to see where the wire is going. Any ideas what we can try???
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if the fuse and relay is fine then check the horn itself. with someone pushing on the horn button check for power at the wire on the horn you should have power if not it could be a broken wire from the horn back to the relay. also check to make sure the horn has a good ground. if you do have power chances are the horn itself needs replacing. sometimes the horn pad goes bad, but that rarely happens.
The horn relay primary receives + full time and is actuated by receiving ground (-) from the horn button. Check ground continuity at the horn button (at the steering wheel) to make sure it is working first (most likely culprit). If the horn button is working, check to see if the horn relay is working (second most likely culprit). To test the horn relay, provide chassis or battery ground to the (-) primary terminal of the horn relay and see if the horn honks. If it does, that will tell you that the problem is in the wiring between the steering wheel and the relay, most likely a disconnected wire at the steering column.
The only other components in the system are the fuse for the horn circuit (if you have 12v at the horn relay, that is fine), and the horn itself. My bet is on the horn button pad itself.
HI, Try to find out first what is the part that cause the malfunction of the horn. The three major part of the horn is the relay, harness & horn pad, and horn itself. Check the relay if it is functioning by replacing it with similar type ( if you have the spare or a similar relay in the relay/fuse box in engine compartment ). Let somebody push the pad horn and if you hear a clicking sound on the relay, it means there is a current that activates the relay( no probs from the horn pad and harness ). Check the horn, just get a wire and directly connect it to the positive pole of the battery and connect it( wire ) to the positive terminal of the horn, it should activate the horn, if not the problem is the horn and you have to replace it.
Hi, you have to conduct a small test yourself to get the cause of the problem
Start by testing the horn itself. Run a jumper wire to the power connector on the horn, and to the positive battery terminal. When you touch the battery terminal, the horn should sound. If it does not, replace the horn.
If the horn is good, the problem is either in the switch in the steering wheel, or in the horn relay!!
Check in your owner's manual for the location of the horn relay. It will usually look like a small metal or plastic box that plugs into either the main fuse box or the high amp fuse box under the hood. If your horn fuse is good then most likely the horn relay needs replaced.
Hi, sounds as if maybe it's the horn itself thats given up, Try removing the terminals from the horn ( easier if the horn is taken off ) and connect direct to a battery, if it has 2 terminals one is feed and the other earth, if it only has 1 terminal use the body of the horn as earth ( - ) and the terminal as a feed ( + ) if no sound, it's the horn, if it works, then connect and test lamp or volt meter to the terminals removed fromt the horn, press horn button and see if you have a reading on the volt meter or he light operates if using a bulb holder. Cheers