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Apr 12, 2018 10:36:40 GMT
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I've installed an air horn on the Sunny because Honk! Honk!
Wired it up to the existing relay for the horn - seemed atraight forward enough:
1. Removed the two old horn buzzers - each only running a live wire from the relay and then earthing at their mounting points.
2. Ran one of those live wires to the positive terminal of air horn compressor and a wire from the negative compressor terminal to a convenient earth point.
Only used it a few times and it's blown the 10A fuse. Can understand that when I realised the compressor is 30A.
What I'd like to know is can I replace the 10A horn fuse with a 30A fuse or is that a really dodgy fire risk?
Also, while it's just popped into my head, there is one old live wire that went to the second of the two original horns - do I need to do anything with that? I just taped over the connector.
All help greatly appreciated.
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Nissan N13 owner | Mechanical neonate since 2016 (Give me all the info)
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Rich
Club Retro Rides Member
Posts: 6,248 
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Air horn blows fuseRich
@foxmcintyre
Club Retro Rides Member 160
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Apr 12, 2018 11:05:28 GMT
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You've kinda covered it yourself in your question. The OE fuse is rated at 10a blow. The compressor requires 30a. Replacing fuses with higher ratings isn't sensible. Using the original relay trigger wires fit a new 40a relay and fuse with new wiring from the battery, and secure and safely insulate the old wiring.
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Apr 12, 2018 13:16:37 GMT
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You've kinda covered it yourself in your question. The OE fuse is rated at 10a blow. The compressor requires 30a. Replacing fuses with higher ratings isn't sensible. Using the original relay trigger wires fit a new 40a relay and fuse with new wiring from the battery, and secure and safely insulate the old wiring. Thanks for the clarification. It did come with a 4-pin relay (stock Sunny relay is only 3 pin), so I'll install that. Take it it might be worth upgrading the wire as well, right? Also, can I use the existing horn fuse slot for the new fuse? |
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Nissan N13 owner | Mechanical neonate since 2016 (Give me all the info)
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edk83
Part of things
Posts: 849
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Apr 12, 2018 13:23:37 GMT
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If you want to do it right leave the existing wiring, relay and fuse exactly as they are.
Fit the new relay with a new thick (at least 40a) wire and 30a inline fuse to the battery (fuse as close to the battery as you can). Use the existing horn + as the trigger wire for the new relay.
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Rich
Club Retro Rides Member
Posts: 6,248
Club RR Member Number: 160
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Air horn blows fuseRich
@foxmcintyre
Club Retro Rides Member 160
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Apr 12, 2018 17:18:20 GMT
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If you want to do it right leave the existing wiring, relay and fuse exactly as they are. Fit the new relay with a new thick (at least 40a) wire and 30a inline fuse to the battery (fuse as close to the battery as you can). Use the existing horn + as the trigger wire for the new relay. Kind of, although double stacking relays is kinda pointless. Would be worth just googling 'wiring air horn' and look at images, using the wire from the horn push as the earth for the switching Side of the relay, and double the live from pin 30 to pin 86 as well. And don't use the original fuse slot, that implies you will use the original wiring.. |
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edk83
Part of things
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Apr 12, 2018 17:28:25 GMT
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Keeping the original would be easier and reversable. Sure the isn't a need for two relays but if it's already there...
Also the push button to horn feed on mine is +
It's like that from the factory, shares the feed with the wiper motor.
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Rich
Club Retro Rides Member
Posts: 6,248
Club RR Member Number: 160
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Air horn blows fuseRich
@foxmcintyre
Club Retro Rides Member 160
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Apr 12, 2018 17:42:07 GMT
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Keeping the original would be easier and reversable. Sure the isn't a need for two relays but if it's already there... Also the push button to horn feed on mine is + It's like that from the factory, shares the feed with the wiper motor. Interesting, so rather than earthing a relay it provides 12V to one. Ok, doesn't complicate anything in the slightest, having more than one not-required complement however just leads to further points for failure. This diagram should make sense if the horn push provides 12V when pushed rather than an earth. Simple to follow. Just imagine the picture of the 'old' horn is the factory relay.  |
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Last Edit: Apr 12, 2018 17:42:48 GMT by Rich
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Apr 12, 2018 17:50:02 GMT
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Air horns like all motors have a high spike in current when you start which drops off to a much lower level very quicky, you could probably make a soft start and use the original wiring.
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edk83
Part of things
Posts: 849
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Apr 12, 2018 17:58:05 GMT
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Wants to spool up fast though, the standard china air horn compressor draws about 14a tops, 20a fuse on mine and a 40a power wire.
Yes lol the only relay the factory Allegro has is a negative triggered fan relay. Everything else is wired through the switch including the headlights! When I flash main beam I can actually see the contact spark on the column contacts!
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Apr 13, 2018 13:52:28 GMT
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Hang on, you're all going a bit too fast for my newbie mind (but thanks a lot for all the info!).
So, going on edk and Rich's comments, I:
1. leave things as were with the standard fuses and relay but wire the factory relay live into 86 on the new relay
2. leave the factory relay earth as is
3. wire 87 to the compressor live
4. leave the compressor earth as is
5. earth 85
6. Wire 30 to to a 30a fuse and then to the battery using 40a wire
I take I'd need to add an additional fuse box for that new wire, right? If anyone's got a link to vid that correctly explains wiring it up, I'd appreciate a suggestion.
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Nissan N13 owner | Mechanical neonate since 2016 (Give me all the info)
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edk83
Part of things
Posts: 849
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Apr 13, 2018 14:08:09 GMT
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Yep, there are a couple of conditions though..
1. your existing horn relay output (wire to factory horn) is +
2. The compressor earth needs to be of decent thickness, as does the 87 to compressor live
the 30 terminal to the battery just needs a 30a inline fuse in a holder rather than a fuse 'box'
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Apr 13, 2018 14:13:20 GMT
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OK, I'll double check the existing horn circuit. Nice one!
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Nissan N13 owner | Mechanical neonate since 2016 (Give me all the info)
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Quick follow up to this to make sure I don't fry myself or my car,
Just watched a video on Youtube (https://www.youtube.com/watch?v=tK9lB1hH-8w) which essentially explains the wiring but for a bike. He says send 85 to the battery negative. We're saying earth. Is it OK to earth the 85 in the same place as the existing horn earth OR do I need to wire 85 to the battery negative?
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Nissan N13 owner | Mechanical neonate since 2016 (Give me all the info)
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Rich
Club Retro Rides Member
Posts: 6,248
Club RR Member Number: 160
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Air horn blows fuseRich
@foxmcintyre
Club Retro Rides Member 160
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Quick follow up to this to make sure I don't fry myself or my car, Just watched a video on Youtube (https://www.youtube.com/watch?v=tK9lB1hH-8w) which essentially explains the wiring but for a bike. He says send 85 to the battery negative. We're saying earth. Is it OK to earth the 85 in the same place as the existing horn earth OR do I need to wire 85 to the battery negative? Seeing as the body is the earth and connected directly to the battery negative terminal either is correct. |
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Cool, thanks man!
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Nissan N13 owner | Mechanical neonate since 2016 (Give me all the info)
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