Hey guys, bought an old volvo for 350 quid fsh and only 53000 miles.
Car runs perfect but horn would not work, i replaced the unit and it worked for a while, but then stopped.
I have checked the fuses and there is current at the horn terminals as i have tested it with a multimeter.
I am stumped any suggestions?
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the horn will work then by you earthing it (ie pushing the button) this is where you need to start of the investigations (1981? dire straits)
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Take the horn unit off put two temporary wires to the battery and see if it works.If you have a supply at the horn then you havn't much left other than the unit.
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have checked the fuses and there is current at the horn terminals as i have tested it with a multimeter.
Depending upon how the measurement was made, it's easy to be misled. Bell Boy has hinted obliquely at this in his post.
Did you actually measure current? or was it voltage?
I suspect you actually measured voltage, with the ignition on, without disconnecting the wires at the horn, and without pushing the horn button, with one lead of the multimeter earthed, you would expect to see 12v at *both* horn terminals. It's only when you push the horn switch, and earth one of them that the voltage at one of the horn terminals should drop to 0.2 - 0.3 volts or so, and the horn sounds.
Test the horn by wiring it straight to a battery - assuming that the horn is OK;
If there's a good supply at the horn - try using the supply to light a 21W bulb as a test lamp with a temporary lead direct to a good earth - the bulb should be lit while the ignition is on, and should be lit regardless of what you do with the horn push.
Assuming all OK so far, then, you need to concentrate on the switched, earth side. To do this, you need to access the switched earth wire at the horn push or switch. I'm not sure how to do that in detail on your car, but, as Bell Boy has suggested, this is a likely source of the problem. There's got to be some mechanism to get the connection into the steering wheel, either a slip ring, or a clock spring.
Number_Cruncher
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