andy p Posted June 24, 2008 Report Share Posted June 24, 2008 I'm a little perplexed by this one. First off horn dosen't work. Replaced one horn as connections were knackered. Fitted new steering column earth lead (bottom). Checked steering column flex coupling earth - present and intact. Fiddled with horn push. Still nothing. Replaced relay with new unit (Lucas 6RA). Bingo - horn works. But NOT with the ignition switch ON ?? Have tried various wiring combinations to the relay as was unsure of PO set up. No joy with the ignition switched on, but works with igntion off. Studying the circuit diagram the horn system is independent of the ignition circuit yes ? Any ideas welcome as will be an MOT failure. Regards AndyP Quote Link to post Share on other sites
foster461 Posted June 25, 2008 Report Share Posted June 25, 2008 I'm a little perplexed by this one. First off horn dosen't work. Replaced one horn as connections were knackered. Fitted new steering column earth lead (bottom). Checked steering column flex coupling earth - present and intact. Fiddled with horn push. Still nothing. Replaced relay with new unit (Lucas 6RA). Bingo - horn works. But NOT with the ignition switch ON ?? Have tried various wiring combinations to the relay as was unsure of PO set up. No joy with the ignition switched on, but works with igntion off. Studying the circuit diagram the horn system is independent of the ignition circuit yes ? Any ideas welcome as will be an MOT failure. Regards AndyP Very strange. The horns hang off the purple circuit and have power all the time, ignition on or off. Other stuff on this circuit includes interior lamps, glove box lamp, headlight flash to pass etc. Do those work with the ignition on ?. If they do the power to the purple circuit is ok and the problem must be with the horn components although I'm struggling to come up with a scenario where they dont work with the ignition on unless the wiring to the relay is totally confused and with the ignition off you are seeing a path to ground and with it on you dont. Double check the relay wiring and if you cant identify each terminal with 100% accuracy take off the relay so you can get a good look at it. Stan Quote Link to post Share on other sites
foster461 Posted June 28, 2008 Report Share Posted June 28, 2008 I'm a little perplexed by this one. First off horn dosen't work. Replaced one horn as connections were knackered. Fitted new steering column earth lead (bottom). Checked steering column flex coupling earth - present and intact. Fiddled with horn push. Still nothing. Replaced relay with new unit (Lucas 6RA). Bingo - horn works. But NOT with the ignition switch ON ?? Have tried various wiring combinations to the relay as was unsure of PO set up. No joy with the ignition switched on, but works with igntion off. Studying the circuit diagram the horn system is independent of the ignition circuit yes ? Any ideas welcome as will be an MOT failure. Regards AndyP FWIW This note was posted to the 6pack today in response to a similar question. Nice piece of diagnostics too. From: 6pack-bounces+stan.foster=hp.com@autox.team.net [mailto:6pack-bounces+stan.foster=hp.com@autox.team.net] On Behalf Of Shannon Muncy Sent: Friday, June 27, 2008 7:39 PM To: Dr L. Kevin McNelis; 6pack@autox.team.net Subject: Re: [6pack] still befuddled This is what's happening: When you take the key out, you're engaging the steering wheel lock thus creating a ground for the horn. When you start the car the wheel lock disengages, just breaking the ground with the steering column. I would think that you're problem is most like the ground strap that is supposed to exist between the upper steering column and the lower. Make sure it's there... also, you should also have a ground connected to the grease fill bolt on your steering rack as well. I had the same issue.. it took me days to figure it out because the ground strap on the upper steering column "looked" like it was installed correctly, but really looped back on itself. Good luck, -Shannon > Horn. New harness, new relay, new ignition switch. Key out of switch, > horn works fine. Put the key in, the horn works fine. Start the > engine (or turn key to the "run" position), no horn. Shut engine off, > leave key in, no horn. Remove key, horn works fine. Quote Link to post Share on other sites
andy p Posted June 28, 2008 Author Report Share Posted June 28, 2008 Thanks for that, I'll double check the earth strap(s) again, although I'm sure the coupling earth was ok.... Regarding the purple wiring circuit, the interior lights/glove box illumination are all not working at the moment, so will sort that out at some point. Many thanks for replies. Regards Quote Link to post Share on other sites
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