Above posters are correct. i install police equipment all day long. This is called a horn ring wire. It is usually tapped so that the officer can set his siren to handsfree and use the horn button on the steering wheel to activate the siren without actually touching his equipment. Look under the...
That yellow mark is where you need to slice the boot. Use a stiff wire and go through the top inside boot. You can feel when you get inside. Use wd40 to help wires slide. I do this everyday on police tahoes.
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