2010-2014 Subaru Legacy Horn Replacement

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Unplug the power connector from the horn, and use a wire stripper to expose a bare portion of the wire. The "20 ga" hole seemed the best fit for this purpose.
The PIAA horns have their power/ground connections on top of the horn, so the stock wire won't be long enough. At the same time, the ground cables that come with the horns are too long -- which is a perfect hack in this case!
Snip about 4" of the ground cable wire (the 1/4" female spade connector side) and use a butt connector to attach it to the horn's power wire.
It may be a good idea to insulate the connection with some electrical tape after it's been crimped properly.

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