Have a look at http://www.mgb-stuff.org.uk/hornrelay.htm
Cheers,
PaulH.
----- Original Message -----
From: j r overcash <jroverca@earthlink.net>
To: Karl Shultz <karl.shultz@ibm.net>; <mgs@autox.team.net>; Paul Hunt
<paul.hunt1@virgin.net>
Sent: Sunday, April 16, 2000 9:24 PM
> Paul,
>
> Could you explain how you set up the relay, I have a similar problem.
Would
> like to get the horns working!!
>
> Safety Fast
> Ross Overcash,74B,NAMGBR 2-1172
> Ayer, MA
> http://home.earthlink.net/~jroverca/index.html
>
> > -----Original Message-----
> > From: owner-mgs@autox.team.net [mailto:owner-mgs@autox.team.net]On
> > Behalf Of Paul Hunt
> > Sent: Friday, April 14, 2000 3:22 PM
> > To: Karl Shultz; mgs@autox.team.net
> > Subject: Re: Missing: horn on 73 B
> >
> >
> > The horns work off the purple circuit (fused, always hot, bottom
> > fuse in the
> > 4-way block), the horn button sends a ground via the purple/black. You
> > should ideally see a full 12v on the purple at all times, perhaps a
little
> > lower when the horns are sounding but not much. If it is much
> > less you have
> > bad connections in the purple circuit. If the interior lights dims
> > significantly when the horn sounds it is probably a corroded
fuse/holder.
> >
> > You should see 12v on the purple/black when the horns are silent, and
> > ideally a full ground when they are sounding. However steering column
> > grounds can be a problem, I opted to use a relay on my 75 V8 as there
just
> > wasn't enough current available through the column to operate one horn
let
> > alone two.
> >
> > PaulH.
> >
> > ----- Original Message -----
> > From: Karl Shultz <karl.shultz@ibm.net>
> > To: <mgs@autox.team.net>
> > Sent: Thursday, April 13, 2000 5:58 PM
> > Subject: Missing: horn on 73 B
> >
> >
> > > Hi all, been lurking for a *long* time now while the B, sadly, stayed
> > > parked with a ton of ignition problems. Finally those are sorted out
> > > and the car is running great. Sunny day - oh, so *that's* why I
bought
> > > it! Anyhow, I'm hoping someone can help me troubleshoot my horn - the
> > > last thing that needs fixed before it'll pass inspection. Here's the
> > > story.
> > >
> > > When I bought the car only one of the two horns worked (low note I
> > > believe) which didn't bother me. About a year ago I'm driving around
> > > with the top down and we get one of those mid-afternoon North Carolina
> > > thunderstorms. It starts to really pour so I pull into the gas
station,
> > > turn off the car and put the top up. Start the car to leave, and both
> > > horns (low note and high note) are blaring non-stop, without me
touching
> > > the button. So that was kind of painful driving around like that.
Get
> > > back to house, turn off car and go inside.
> > >
> > > The next day - start car, horn isn't blowing. This is good. So I hit
> > > the horn button, and both horns (lo and hi) come on. Sweet!, I'm
> > > thinking, it's fixed. Well, not so fast. One day later, start the
car
> > > to go to work, hit horn button...and there's nobody home at all,
neither
> > > horn does anything. Doh!
> > >
> > > I've done the requisite checks with the test light at the pencil
switch
> > > on the steering wheel and at the horns - nothing. Any ideas? Is
there
> > > a fuse buried somewhere that I haven't seen yet? Any info would be
> > > highly appreciated - the car's been parked for almost a year now and
I'd
> > > really like it to be legal.
> > >
> > > --
> > > Karl Shultz
> > > Tarheel Sports Car Club - www.thscc.com
> > > 95 Integra GS-R, STR/DSP #78
> > > 73 MGB, it's alive, but not legal yet...
> > >
> > >
>
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