Blowing fuse - why?

bakers · Sep 30, 2013

Hi,

Recently fitted a new 'Ring' dual horn, activated from the original horn through a relay.

Horn works fine at stand still and on tick over, however after driving for around 1/2 mile the fuse on the supply to the relay blows!

There must be a surge which is blowing the fuse, I have wired to the feed to the fuse box and also directly to the battery, same result.

Any ideas?

Steve

SteNova · Sep 30, 2013

Does it blow even if you don't use the horn?

123-eddy09 · Sep 30, 2013

Does the fuse blow when operating the horn or just on its own?

Kwakerman · Sep 30, 2013

Most horns have a permanent 12v supply and it is the earth wire that is switched to sound the horn. You probably have a chaffed supply wire that is shorting to the chassis through vibration while driving, this will cause fuse to blow.

bakers · Sep 30, 2013

It blows the fuse even if I don't use (operate) it

timtheenchanteruk · Oct 1, 2013

Kwakerman said:
Most horns have a permanent 12v supply and it is the earth wire that is switched to sound the horn. You probably have a chaffed supply wire that is shorting to the chassis through vibration while driving, this will cause fuse to blow.

+1 the switch on the horn switches the earth.

goldypurple · Oct 1, 2013

Fuse is shorting out along the line somewhere, check all wiring for any nics that could be touching any metal of the vehicle.

Blowing fuse - why?

bakers

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SteNova

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123-eddy09

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Kwakerman

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bakers

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timtheenchanteruk

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goldypurple

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