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No. The horn and the turn signals are on completely different fuses and wiring. I don't know why you thought that the horn could be made to stay on by the turn signal, but that's your answer.

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The turn signal switch and it's plastic housing could pinch the horn wire against the steering column and cause the horn to sound. You would probably hear a change when you wiggle or click the turn signal switch.

This can happen because many horn relays are activated by grounding the wire inside the steering column, so if the insulation is damaged it can easily be made to sound.

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Q: Can the turn signal switch cause the horn to stay on?
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