My horns seem to oscillate between each other when operated. Each one works fine on its own. I have an earth and a power feed that Ive split and routed to each. What have I done wrong ? ? ?

It just COULD be that both are operating perfectly at nearly the same frequency so the sound cancels, then reinforces at the deifference between the two frequencies. This would give an "oscillating" sound envelope. It can happen - honest!
Bob

wy u use 2 the same??

if you make the output hole from one a bit different you are done..

it will increase decrease air speed / pressure and change sound..


else you could use 2 relais


they never come up at same time..soow the start of the horn will be different

Tks

You need to fit a relay or dump one of them. There's not enough power going down the wire to sound them both at once.

I have one relay powering them both, you think I need to put 2 relays in ? bit of a bummer as the feed wire is all nice and neatly shrouded all the way to the front.

Can I just ditch one ? I thought (for whatever reason) that horns need to be twin tone.

One relay should be fine. You can use thin wire to switch the relay on, and thick high-current wire to drive the horn.
Pete's point is valid - do you have thick-enough wire to drive 2 horns? They take a LOT of amps and they may be struggling.

If the wire is thick enough, you haven't got a horn that's out of adjustment, have you? Try each one separately and tweak it if it sounds a bit croaky (there's usually a screw in the middle for tweaking).

Otherwise just use 1 horn for the SVA, and save the fiddling for later.

rgds,
David

They both work fine on their own. I guess the wire isnt up to the job then, although its pretty heavy stuff.

Wire them both up together temporarily and connect them directly to the battery - just a foot or two of good thick wire. If they work well in that situation then your wiring is suspect.

The trouble with a long run of thin wire is that the high current required for horns will cause a large voltage drop, and the remaining volts may not be enough to operate the horns properly.

Just a thought - once you've tried the horns out of the car, run a temporary length of thick wire in parallel to the existing one (just lay it along the chassis) from the relay to the horns. If the extra wire (and reduced resistance) allows the horns to sound correctly then the solution is easy...

David

[Edited on 23/6/05 by David Jenkins]

Sounds like youve wired the 2 of em in series instead of parallel.
Cheers,
Bob

quote:

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Originally posted by splitrivet
Sounds like youve wired the 2 of em in series instead of parallel.
Cheers,
Bob

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I have split the feed and ground wires and put one from each to each horn, Ive tried each pair on their own on each horn and both work OK, its just when I connect both at the same time.

how do they look?

to each other??

rotate the claxon.. for example one facing forwards the other downwards...

isn't it possible that the vibrations of one make other switch one switch off etc..??

regards,

Tks

Could be 'sympathetic resonance' if they are in the same harmonic range ............. bloody hell, did I just say that?

Try reversing the polarity of one of the horns (if they don't use chassis as earth of course)