[Tigers] Horn Wiring

Sun Sep 24 20:04:42 MDT 2023

Using a relay (as I had originally thought /might/ be there... but 
wasn't, and Theo recommends) would simplify the situation_if the horns 
are actually grounded already_ as you state. The already present 12v+ 
near the horn would become the relay input (30) and loop to provide 12V+ 
power to the relay coil (85). The ground-able horn contact would provide 
ground to the relay coil - (86) and complete the 12V+ circuit providing 
12V+ power output (87) to the horns. The numbers refer to the typical 
relay designations. And, yes the 12V+ just daisy chains to the next horn 
also.

So, the ground is constant at the horn. 12V+ is constant at the relay 
input and the coil +. Grounding the horn at the steering wheel ring will 
trigger the relay to close and send 12V+ to the horns.

On 9/24/2023 5:41 PM, Robert Wanty wrote:
> 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
>>>     <http://system.to> its original splendor.
>>>
>>>
>>>     Bob
>>>
>>>
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>>>
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>>>
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