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So I bought a 12 volt electric wolo horn. The instructions say put the red wire on a 12v source. Can I put it directly to my car batterys red input?. 08 fj btw
 

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'Directly' usually means no fuse, so no, you want to have at least a fuse in line.

Next to that, it depends on how you want the horn to work. The factory horn has a relay and a 10A Fuse which should be plenty to power the wolo.

The factory horn should have one GRAY/BLK wire, which should be power and thats it. It grounds itself though the bolt.
 

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if I remember correctly, the 08 is prewired for an extra horn. It is in the wiring harness running along the passenger-side inner fender well. There are some pics here on the site. Search for horn install. We did it on opie's TT several years ago. It was plug and play.
Jax':wave:
 
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