↓ Advertise on Defender2 ↓

Home > In Car Electronics > wiring twin horns, not air
Post Reply  Down to end
Page 1 of 1
Print this entire topic · 
jeffersj



Member Since: 23 Jan 2015
Location: Near Preston
Posts: 386

United Kingdom 1996 Defender 90 300 Tdi HT Bronze Green
wiring twin horns, not air

The single horn (300Tdi) has died so thought I would fit a high and low tone snail type. If I just connect them in parallel using the original wires they should work but thought I would fit in a relay.

Rather than run a long wire back to the battery positive I wondered if I can tap into the live feed currently used for the relay to the spot lights, somehwere between the battery and relay?

Apologies if it has been covered already but a search did not quite answer the particular query. Jeff
Ex 1968 Series 2A
Ex 90 TD5
Ex D3
Ex D4

Post #925513 13th Oct 2021 2:06pm
View user's profile Send private message View poster's gallery Reply with quote
LandRoverAnorak



Member Since: 17 Jul 2011
Location: Surrey
Posts: 9907

United Kingdom 2013 Defender 110 Puma 2.2 USW Orkney Grey

It's unconventional but there's no reason why you can't as long as the wiring and fuse are sufficient for the load of both the spots and horns being used together. Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia

Post #925604 14th Oct 2021 11:17am
View user's profile Send private message View poster's gallery Reply with quote
jeffersj



Member Since: 23 Jan 2015
Location: Near Preston
Posts: 386

United Kingdom 1996 Defender 90 300 Tdi HT Bronze Green

Thanks Darren, I had put a heavy duty cable from the battery to the spots relay. Jeff
Ex 1968 Series 2A
Ex 90 TD5
Ex D3
Ex D4

Post #925613 14th Oct 2021 12:19pm
View user's profile Send private message View poster's gallery Reply with quote
donmacn



Member Since: 07 Nov 2017
Location: Nth Scotland
Posts: 1404

This post caught my eye, because I could be in more or less exactly the same situation. The old horn might well be original, isn’t working at the moment, and as I’ve written elsewhere is a bit of a “wimpy toot” anyway…!

I do have a lot of additional wiring along the N/S inner wing, for the spots, and the Landreiziger fan mod; and the Optmill wash pump, (all of which I still need to tidy up to my satisfaction) so I don’t really want to add any more spaghetti.

Is it possible just to add the two tone ones to the original wires without any issues? Donald

1994 Defender 300Tdi 110 SW - owned since 2002 - 230k miles and going strong
(The 'rolling restoration' or tinkering thread: http://www.defender2.net/forum/topic58538.html )
2000 Range Rover P38 4.0L V8

in the past..
RR classic - fitted with 200Tdi
1984 RR classic - V8 with ZF auto box
1993 Discovery 300Tdi

not to mention the minis and the Type 2 VW camper...

Post #925670 14th Oct 2021 7:14pm
View user's profile Send private message View poster's gallery Reply with quote
L110CDL



Member Since: 31 Oct 2015
Location: Devon
Posts: 9212

England 

Yes Donald as this is what i have done with my twin horn set up with no relay and they have been on a long time now with no issue's Very Happy



Click image to enlarge


Yes i knew the live was not protected, not thinking Rolling Eyes but soon put that right




Click image to enlarge


Thumbs Up 1996 Golf Blue 300Tdi 110 Pick up. Keeper.

regards
Clayton.

Post #925700 14th Oct 2021 9:44pm
View user's profile Send private message View poster's gallery Reply with quote
Mossberg



Member Since: 29 Feb 2020
Location: Lancs
Posts: 123

United Kingdom 1993 Defender 90 300 Tdi HT Aintree Green

What is the difference between the single and twin horn? Is the tone you wanted to change or the volume?

Post #925721 15th Oct 2021 6:28am
View user's profile Send private message View poster's gallery Reply with quote
jeffersj



Member Since: 23 Jan 2015
Location: Near Preston
Posts: 386

United Kingdom 1996 Defender 90 300 Tdi HT Bronze Green

I spliced into the fused wire (battery to spot relay) to bring a live feed to the horn relay. What Donald has done is fit the new horns in parallel without a relay, unfortunately I bought horns with a single terminal so could not use the parallel method and following wiring diagrams on the web fitted the new live to 30 (on the relay) , the 2 original horn connectors to 85 and 86 and the new horns to 87. Spots still working but no horn???

According to the tiny wiring diagram supplied with the horns the connections differ in that 1 of the old horn wires goes to 85 and the other to earth, the live to 30 and 86, then 87 to the horns as before. I queried this with supplier and they confirmed the original negative is not connected . Seems strange so will give that a try today.

Lesson - should have checked before ordering that the horns were 2 terminal type! Jeff
Ex 1968 Series 2A
Ex 90 TD5
Ex D3
Ex D4

Post #925745 15th Oct 2021 9:42am
View user's profile Send private message View poster's gallery Reply with quote
LandRoverAnorak



Member Since: 17 Jul 2011
Location: Surrey
Posts: 9907

United Kingdom 2013 Defender 110 Puma 2.2 USW Orkney Grey

That suggests that the new horn is earthed through it's fixing - might be worth a test with a 12v feed to confirm that before going any further.

Assuming that is the case though, you'll still need to connect an earth to either terminal 85 or 86, with the old horn feed to the other, else the relay coil won't work. Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia

Post #925747 15th Oct 2021 9:57am
View user's profile Send private message View poster's gallery Reply with quote
donmacn



Member Since: 07 Nov 2017
Location: Nth Scotland
Posts: 1404

Thanks Clayton - that’s more or less exactly what I was hoping to do. So, the 2x live and 2 x earth in your pictures just join onto the existing/standard wiring? I thought I’d try and fit them nearer the front grille, but not sure I’ll have room with the bigger inter cooler…. Question

Jeffers - it was Clayton rather than myself who’s done this, but your post highlights that I need to make sure to get horns with two terminals. It’s the kind of thing I’d probably have overlooked myself. Donald

1994 Defender 300Tdi 110 SW - owned since 2002 - 230k miles and going strong
(The 'rolling restoration' or tinkering thread: http://www.defender2.net/forum/topic58538.html )
2000 Range Rover P38 4.0L V8

in the past..
RR classic - fitted with 200Tdi
1984 RR classic - V8 with ZF auto box
1993 Discovery 300Tdi

not to mention the minis and the Type 2 VW camper...

Post #925751 15th Oct 2021 10:28am
View user's profile Send private message View poster's gallery Reply with quote
jeffersj



Member Since: 23 Jan 2015
Location: Near Preston
Posts: 386

United Kingdom 1996 Defender 90 300 Tdi HT Bronze Green

Rewired according to suppliers instructions still no joy so refitted old horn (without relay) and it did not work! Tried the horn on a seperate battery dierct and low and behold it works.

It therefore seems that it is the stalk failing as previously I would only get one blast and then a weak effort and yet indicators, main beam working but not headlight flasher.

Should had tested horn before messing about- another lesson learnt! Still fancied twin horns though but not with this weird wiring diagram. Jeff
Ex 1968 Series 2A
Ex 90 TD5
Ex D3
Ex D4

Post #925822 15th Oct 2021 5:27pm
View user's profile Send private message View poster's gallery Reply with quote
jeffersj



Member Since: 23 Jan 2015
Location: Near Preston
Posts: 386

United Kingdom 1996 Defender 90 300 Tdi HT Bronze Green

UPDATE Decided to check all connections despite fearing stalk u/s and at the same time tried a live feed to test that the horns were earthed through their fixings as Darren suggested and they are.

Tried replacing the old horn wire that was unconnected (as per the diagram) with the connected one to 85
and magically the horn worked!! I thought it did not matter which one of the old wires I used but there you go.

Auto wiring will never cease to amaze me so now I will have a spare stalk for the future which i am sure I will need. Jeff
Ex 1968 Series 2A
Ex 90 TD5
Ex D3
Ex D4

Post #925957 16th Oct 2021 5:02pm
View user's profile Send private message View poster's gallery Reply with quote
LandRoverAnorak



Member Since: 17 Jul 2011
Location: Surrey
Posts: 9907

United Kingdom 2013 Defender 110 Puma 2.2 USW Orkney Grey

Excellent Very Happy Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia

Post #925962 16th Oct 2021 5:29pm
View user's profile Send private message View poster's gallery Post Reply
Post Reply  Back to top
Page 1 of 1
All times are GMT + 1 Hour

Jump to  
Previous Topic | Next Topic >
Posting Rules
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum



Site Copyright © 2006-2021 Futuranet Ltd & Martin Lewis