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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">New or period correct air horns provide ano=
ther option.<div><br></div><div>The louder the better.<br><div><br></div><di=
v>Allan Ballard</div><div>-Atlanta (Mk1a Tiger with period correct air horns=
)<br><br><div dir=3D"ltr">Sent from my iPhone</div><div dir=3D"ltr"><br><blo=
ckquote type=3D"cite">On Sep 25, 2023, at 4:18 PM, GARY WINBLAD <garywinb=
lad@comcast.net> wrote:<br><br></blockquote></div><blockquote type=3D"cit=
e"><div dir=3D"ltr">=EF=BB=BF
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Most all aftermarket horns have only one terminal or have 2 terminals tha=
t are both 12V.
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There was only one brand that Paul Reisentz found to use.. I wish I could=
remember.
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I think it was SPAL (the fan guys) but googling I can't find them.
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I remember because I dissected a defective original horn for him. U=
nlike Theo, I couldn't
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see any way to fix that one.
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<div class=3D"default-style">
Bob, you will probably need to look for some original horns (that still w=
ork) or add a relay for the
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fans you already have.
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<div class=3D"default-style">
Gary W.
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</div>=20
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<blockquote type=3D"cite">=20
<div>
On 09/24/2023 8:08 PM PDT Bob Wanty <bobwanty@gmail.com> wrote:
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My horns have a single terminal so I will get two terminal horns. The re=
lay idea sounds good.
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<div dir=3D"ltr">
Thanks for the help.
</div>=20
<div dir=3D"ltr">
Bob
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<div dir=3D"ltr">
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<blockquote type=3D"cite">
On Sep 24, 2023, at 9:45 PM, Theo Smit <tsmit@shaw.ca> wrote:
<br>
<br>
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t; color: #000000;">=20
<div>
Hi Bob,
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<div>
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<div>
The wiring diagram here: <a href=3D"http://tigersunited.com/resources=
/wsm/tt-images/MKIABIGwiring.jpg">http://tigersunited.com/resources/wsm/tt-i=
mages/MKIABIGwiring.jpg</a> shows two solid purple wires to the horns feedin=
g 12 volts, and two purple with black stripe wires that are the horn ring co=
nnections. There is no separate jumper wire from one horn to the other; if y=
our car has that then it was added by a previous owner.
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<div>
<Screenshot 2023-09-24 at 7.34.26 PM.png>
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<div>
But, if the horns already start to sound when you connect just the ho=
t side, then there is an internal short in at least one horn, which is not h=
ow it's intended to be. if you have an ohm-meter that can measure very low r=
esistances then you can take measurements across the two horn terminals and f=
rom each terminal to the horn body (or the frame mount). That would help you=
isolate where the wiring problem is.
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<div>=20
<div>
<Screenshot 2023-09-24 at 7.38.18 PM.png>
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<div>
This is a sketch of the high-tone horn. The low-tone horn has an L ca=
st into the bell. The two terminals connect (through the wire coil and the p=
oints) to each other, but there should be no connection to the horn body its=
elf. The way you're describing the operation of your horns, connecting one o=
f the terminals to hot causes the horn to go, even if the other wire is not c=
onnected (or, without pushing the horn ring on the steering wheel).
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<div>
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<div>
Do both horns work the same way (i.e. they go off when only the hot i=
s connected) or does only one horn do that? If one horn works properly (conn=
ect the purple wire to one terminal, connect the purple-with-black-stripe wi=
re to the other) then that horn is fine and it's the other one that has an i=
nternal short. It can probably be fixed by opening the horn up and figuring o=
ut where the short is.
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<div>
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<div>
Theo
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<div>
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<hr id=3D"zwchr" data-marker=3D"__DIVIDER__">=20
<div data-marker=3D"__HEADERS__">
<strong>From: </strong>"Bob Wanty" <bobwanty@gmail.com>
<br><strong>To: </strong>"Theo Smit" <tsmit@shaw.ca>
<br><strong>Cc: </strong>"Tom Witt" <atwittsend@verizon.net>, "=
tigers" <tigers@autox.team.net>
<br><strong>Sent: </strong>Sunday, September 24, 2023 6:41:37 PM
<br><strong>Subject: </strong>Re: [Tigers] Horn Wiring
</div>=20
<div>
</div>=20
<div data-marker=3D"__QUOTED_TEXT__">=20
<div dir=3D"ltr">
Thanks for the responses.=20
<div>=20
<div>
Everything is wired to the horns, they look original. There are 2 p=
urple wires to each horn, one is hot from the fuse box the other wire goes t=
o ground when the horn ring is pressed. When I plug the hot wire to the =
; horn it works fine, even honks. So the horns must not be original since th=
ey are grounded to the frame. I still have 4 purple wires when I only h=
ave connections for two and the wiring diagram only shows two wires, one to e=
ach horn.
</div>=20
</div>=20
<div>
So should I isolate the horn frame ground, plug the hot wire to the=
horn, use the existing jumper between the horns and connect the horn ring w=
ire to the other horn?
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</div>=20
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<div class=3D"gmail_quote">=20
<div class=3D"gmail_attr" dir=3D"ltr">
On Sun, Sep 24, 2023 at 1:50=E2=80=AFPM Theo Smit <<a href=3D"ma=
ilto:tsmit@shaw.ca" target=3D"_blank" rel=3D"noopener">tsmit@shaw.ca</a>>=
wrote:
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<blockquote>=20
<div dir=3D"auto">=20
<div dir=3D"ltr">
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<div dir=3D"ltr">
Correct except that Rootes (or Lucas) would never use a relay whe=
re they could instead pass all the current through a finicky sliding contact=
.
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<div dir=3D"ltr">
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Bob, the horns, when properly adjusted, draw about three amps eac=
h. It would be a good idea to wire in a cube type relay so that the ring con=
tact does not have to pass that much current.
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<div dir=3D"ltr">
If you like I can draw up a wiring diagram for that.
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<div dir=3D"ltr">
</div>=20
<div dir=3D"ltr">
Theo
<br>=20
<blockquote>
On Sep 23, 2023, at 10:52 PM, Tom Witt via Tigers <<a href=3D=
"mailto:tigers@autox.team.net"; target=3D"_blank" rel=3D"noopener">tigers@aut=
ox.team.net</a>> wrote:
<br>
<br>
</blockquote>=20
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<blockquote>=20
<div dir=3D"ltr">=20
<p>I believe most horns have a relay and the 12v+ is already at s=
aid relay. When the horn ring makes contact it GROUNDS the relay (completing=
the circuit) and the relay contact points connect. That passes through the 1=
2V+ to the horns. So, typically the horn ring simply grounds the relay to ac=
tivate it. Sorry too late for me to check the manual for Tiger specifics but=
MOST cars function that way.</p>=20
<p> Think of yourself standing at a light switch in the hou=
se. When someone presses you on the shoulder (connecting to ground) you and t=
he switch act like the relay moving the switch to the on position. This then=
send power to the light (horn). When the person pressing on your shoulder r=
eleases you turn the switch off. Hope that helps.</p>=20
<div>
</div>=20
<div>
On 9/23/2023 5:59 PM, Robert Wanty wrote:
</div>=20
<blockquote>=20
<div dir=3D"ltr">
I am working on wiring the horns for the first time since my 1=
5 year restore. I am working with the original wiring harness and horns. Sta=
rting at the horns there is one on each side with a jumper wire betwee=
n the two horns, there are 2 purple wires leading to each horn, one wire on e=
ach side is hot and wired to the fuse box the second wire is not hot o=
r grounded. I installed a new horn ring from SS and have one wire from the c=
ontact on the horn ring and a second wire for the circle contact off the sig=
nal switch, I think the wire for the circle contact should be hot but I=
don't seem to have a connector for it in the harness under the dash and not=
hing for the wire to the horn ring.=20
<div>
It would seem to me that I should have a hot wire to the ring=
contact then a hot to the horns when the horn ring is pressed. but the wiri=
ng harness does not seem to follow that way of thinking.
<br>=20
<div>
The wiring diagram is some help but as usual my limited know=
ledge on this will probably start a fire.
</div>=20
<div>
Any help would be appreciated, I would rather not rewir=
e the circuits so hopefully I can restore the Lucas <a href=3D"http://system=
.to" target=3D"_blank" rel=3D"noopener">system.to</a> its original splendor.=
</div>=20
<div>
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<div>
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<div>
Bob
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<div>
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<div>
<br>=20
<div>
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