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Horn Wiring

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Any one any ideas how to wire up the horn electrics on a 320TL 1980's.

I have the original horn and there are two spare wires available on the loom.

These are coloured yellow and yellow with black stripe.

What I really need to know is are these two wires connected directly to the horn or is one of them connected via a switch to earth.

Any help appreciated.

John

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