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Re: Horn Info Needed

To: Tom Wagner - Program Manager <tom.w.wagner@Central.Sun.COM>
Subject: Re: Horn Info Needed
From: Robert Allen <>
Date: Fri, 13 Dec 1996 12:25:37 +0000
Tom Wagner - Program Manager wrote:
> To All:
> Is there a way to hook up 2 horns
> to a 67 B roadster???  One on each
> side of the front firewall.

Yep, you can hook up all the horns you want but you *must* figure out
how to use a horn relay and a separate fuse. A horn draws quite a bit of
current and the relay keeps the current out of your steering wheel.

Basically, a horn relay is an electircal switch. Once installed, when
you *honk the horn*, it brings a little juice to the relay. The relay
then energises a heavy duty switch that will send a lot of curret to
your horns. All horn relays work pretty much the same. Use a heavy gauge
wire (14 or 16 gauge) off the starter or alternator (or, maybe, the
voltage regulator if you still got a generator in your '67) with a big
inline fuse (for your horn rating, probably 20 or 30 amps).

Electrical horns don't care about positive or negative ground. Neither
do relays.
> Also why does the horn only make a faint
> peep when pressing on the steering
> horn button????

Probably because MGs never used horn relays. Over the years you get a
lot of current through the switch in the steering wheel and the contacts
are burned and blackend and won't carry very much current.

It's a pain to get to and then clean up the horn contacts in the stock
steering column -- best to consult a manual.

Bob Allen, Kansas City, '69MGC/GT, '75TR6

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