Help! I've got a 1983 Tercel SR5, and I'm trying to run a pair of wires through the firewall, to operate a secondary horn (have problem with the main horn operation). I have looked around the firewall, and can't find a good place to drill. Plus, it appears to have double- wall firewall, so I'd have to match up holes etc.. There is some room to drill on the passenger side, but I'm afraid of hitting the heater core with the drill.
I'm trying to avoid completely tearing apart the dash and kickboard area from inside, if I can avoid it. I am hoping some of you can suggest good ways to pass a couple of wires (standard-size; like in wiring harnesses) from the passenger compartment through to the outside, even if it's through the floorboard (I have been advised against drilling there, due to moisture, fumes etc. getting into the car).
Suggestions welcome!!
Thank you all,
Lee Black Forest, CO