Smartpans ran some through the grommet in the battery compartment for a second horn. Here's his description: Once you gain access to the battery you will see a large rubber grommet on the right side of the battery well. It is marked by yellow arrows in the photo below. That grommet has one large wire loom going out the center of the grommet. But around the large loom the grommet has 3 indentations – actually reverse “nipples.” If you take a sharp object, like an ice pick, you can easily punch a hole through the nipple. Don’t make the hole too large. Don’t just go chopping a large hole. If you keep the hole small enough, you can push the wire through and the rubber will “self-seal” around your wire, thus maintaining your waterproofing. I pushed about two feet of wire through, then got underneath the car and peered through the openings in the plastic belly pan to find the wire. You will need a light and a small mirror to do this. Once you find the wire you can start routing it towards the front. Keep the wire inside the belly pan and away from any suspension parts. I finally got my wire through to the front by routing it through the same holes that had been cut at the factory for the air conditioning tubes. The best way to find those holes is to locate the silver colored tubes up front near the location where you will be putting the air compressor. Follow the tubes back and down towards the bulkhead and you will see the cut-outs in the plastic belly pan. In my particular case I ran four separate wires from the battery area to the front of the car. Then I encased all of them in some of that black convoluted wire loom.
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