I have a car without a working horn. Only the wires are in the engine bay, so I bought a new horn and fitted spade connectors to the wires plugged in and nothing. Fuse is same as internal light I hear and that works, don't have a volt meter to check current at end of wires, but I'm dubious about the horn push itself, the wires are connected behind the steering wheel, but my horn push just pulls out and isn't attached leading me to think part of the mechanism may be missing? What should I expect inside the horn push? I have 2 springs which sit in place and a brass plate on the back of the button, am I missing anything? Any suggestions?
Technical Horn push innards?
- Thread starter Mark0
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Technical Horn push innards?
No that's right - the button bridges the gap between the springs and the centre. If you want to check the power supply you can use a test light with one end on the steering wheel centre nut and touch the other end to the plate at the base of one of the springs, should be power there.
Don't need a voltmeter, just one of these:
http://www.ebay.co.uk/itm/Draper-Ca...397677?hash=item5883fb2a2d:g:B80AAOSwPcVVz072
makes life much easier tracking electrical gremlins.
Don't need a voltmeter, just one of these:
http://www.ebay.co.uk/itm/Draper-Ca...397677?hash=item5883fb2a2d:g:B80AAOSwPcVVz072
makes life much easier tracking electrical gremlins.
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Yep, they never have problems with flat battery when you need them.
All cheap meters does have tendency to eat batteries even if in power off position.
Is the most likely problem a dead horn unit? Everything else "seems" OK.
If the horn push is missing the screws that hold it in to the wheel, that is your problem, the connection to earth is made with the screws. I am presuming you have a 4 spoke wheel though?
Yeah no screws, that could be it. Thanks.
keep note that the horn is switched via an earth meaning you wont get much of a voltage through it if you are using a tester.
often when the horn is not working i find it is the spade connectors on the horn its self not making a contact.
as always, copper grease is your friend.
also on the slip ring on the steering wheel, make sure that the small brushes are contacting the slip ring.
turn the steering wheel while the button is pressed.. see if that works.
often when the horn is not working i find it is the spade connectors on the horn its self not making a contact.
as always, copper grease is your friend.
also on the slip ring on the steering wheel, make sure that the small brushes are contacting the slip ring.
turn the steering wheel while the button is pressed.. see if that works.
Any idea what thread size/length the screws are? M1 metric fine I'd guess.
Not sure from the top of my head, but likely to be M3 I would think, not sure on pitch sorry.
Hmm. Sorry for all the questions, but I've never had screws in it to compare to what it should be, do they go in from behind the steering wheel?
yeah, if you have the steering wheel like this one in the picture, theres 2 screws on the back
Fixed, I always had a couple of screws kicking about and often wondered where they came from. Seems they were for the horn. Job done, thanks guys 
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