10 replies to this topic

[Miniphernalia.co.uk]

I am tired of the puny little french made Horn on my late model MPi and have bought some twin air horns.

I fitted these years ago to my 1992 SPi with no problems but Rover have only gone and made things a lot more complicated and I am at a loss!

Okay, Trumpets fitted under the passenger side wing and air pump mounted in place of the horn on the inside wing - sorted.

Now, I have a twin connector plug, if I take a test wire from each to the spade terminals on the pump all I get is the pump struggling and a tiny peep from the horns. Now my wire diagram says that the horn power feed comes from a relay already so I really dont want to add another if I can help it, so am I putting the wires in the wrong place and the horn diagram suggests that one of the pump spades should be used as an earth rather than its body as earth?

[Bungle]

have you tried oiling the pump ?

[Miniphernalia.co.uk]

have you tried oiling the pump ?

No, but its a new pump, is that required?

Its more of an electrical problem, which wire goes where?

[Mattl]

Have you tried swapping the terminals over?

It could also be that you have bad connections on your "test wire" and it needs connecting it properly.

[Miniphernalia.co.uk]

Have you tried swapping the terminals over?

It could also be that you have bad connections on your "test wire" and it needs connecting it properly.

Wires are okay, from what I can make out, there are tw wires that goto the horn normally, one is from the horn switch on the wheel and the other is from the alarm system. The horn earths through its body mount.

Now with the air horn fitted, there is only one positive pole and it earths through a negative pole and not body.

I am thinking of joining the two positives to the one pole but i dont want to fry the alarm ecu....

Also, when testing, it may seem that the air horn pump is drawing too much from the main supply as when the car is running the revs dip whilst idling...

All very confusing?

[daemonchild]

Have you got a multimeter? I recon every mini owner should own one.
Maplin are selling these cheap at the moment.

If so you can test to see if you're getting an appropriate current and voltage at the point you're trying to test.
I'd imagine that the 'manual' that comes with you air horns will have this detail in it with a wiring diagram.

[Miniphernalia.co.uk]

Have you got a multimeter? I recon every mini owner should own one.
Maplin are selling these cheap at the moment.

If so you can test to see if you're getting an appropriate current and voltage at the point you're trying to test.
I'd imagine that the 'manual' that comes with you air horns will have this detail in it with a wiring diagram.

The wiring diagram with the Horns doesnt mention anything about the required amps, I think it must be higher ampage than is required to run the stock horn even with a relay built in under the dash. What I am going to do is retain the original horn for the alarm and wire in a new relay from the horn switch to the ait pump, i think...

[MR-SKIMMED]

Does sound like the compresser is dry. Just try connecting straight to a battery but hold on to it as it will try to rotate

[L400RAS]

Does sound like the compresser is dry. Just try connecting straight to a battery but hold on to it as it will try to rotate

Most airhorns come with a relay, i would recommend fitting one, with beefy wiring, straight from a good power source (starter motor) - including an inline fuse for safety.
Ryan

[MR-SKIMMED]

Does sound like the compresser is dry. Just try connecting straight to a battery but hold on to it as it will try to rotate

Most airhorns come with a relay, i would recommend fitting one, with beefy wiring, straight from a good power source (starter motor) - including an inline fuse for safety.
Ryan

Sorry i meant just to test it, Barspeed said there was a lot of drain (idle speed lowering), so before he possibly puts something under to much load he could just check the compressor, not as a permanant installation

[Miniphernalia.co.uk]

Does sound like the compresser is dry. Just try connecting straight to a battery but hold on to it as it will try to rotate

Most airhorns come with a relay, i would recommend fitting one, with beefy wiring, straight from a good power source (starter motor) - including an inline fuse for safety.
Ryan

Sorry i meant just to test it, Barspeed said there was a lot of drain (idle speed lowering), so before he possibly puts something under to much load he could just check the compressor, not as a permanant installation

Got it fixed by an auto electrician instead with the use of the relay in the end. Also it looks like the battery is the wrong one as it appears to be for an earlier car rather than a high amp battery for the later MPi....