[Tigers] Horn Wiring

[Robert Wanty]

Thanks for the responses.
Everything is wired to the horns, they look original. There are 2 purple
wires to each horn, one is hot from the fuse box the other wire goes to
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 they are
grounded to the frame.  I still have 4 purple wires when I only have
connections for two and the wiring diagram only shows two wires, one to
each horn.
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 wire to
the other horn?

On Sun, Sep 24, 2023 at 1:50 PM Theo Smit <tsmit at shaw.ca> wrote:

> Correct except that Rootes (or Lucas) would never use a relay where they
> could instead pass all the current through a finicky sliding contact.
>
> Bob, the horns, when properly adjusted, draw about three amps each. It
> would be a good idea to wire in a cube type relay so that the ring contact
> does not have to pass that much current.
> If you like I can draw up a wiring diagram for that.
>
> Theo
>
> On Sep 23, 2023, at 10:52 PM, Tom Witt via Tigers <tigers at autox.team.net>
> wrote:
>
> 
>
> I believe most horns have a relay and the 12v+ is already at said relay.
> When the horn ring makes contact it GROUNDS the relay (completing the
> circuit) and the relay contact points connect. That passes through the 12V+
> to the horns. So, typically the horn ring simply grounds the relay to
> activate it. Sorry too late for me to check the manual for Tiger specifics
> but MOST cars function that way.
>
>  Think of yourself standing at a light switch in the house. When someone
> presses you on the shoulder (connecting to ground) you and the 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 releases you
> turn the switch off. Hope that helps.
>
> On 9/23/2023 5:59 PM, Robert Wanty wrote:
>
> I am working on wiring the horns for the first time since my 15 year
> restore. I am working with the original wiring harness and horns. Starting
> at the horns there is one on  each side with a jumper wire between the two
> horns, there are 2 purple wires leading to each horn, one wire on each side
> is hot  and wired to the fuse box the second wire is not hot or grounded. I
> installed a new horn ring from SS and have one wire from the contact on the
> horn ring and a second wire for the circle contact off the signal 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 nothing for the
> wire to the horn ring.
> 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 wiring harness
> does not seem to follow that way of thinking.
> The wiring diagram is some help but as usual my limited knowledge on this
> will probably start a fire.
> Any help would be appreciated, I would rather not rewire the circuits so
> hopefully I can restore the Lucas system.to its original splendor.
>
>
> Bob
>
>
>
>
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