Does the Ford Econoline have unused factory firewall "pass through wires" or "customer courtesy wires" like some of the newer Ford trucks? I need to hook up my alarm siren and would rather not pass my own wire through the firewall if possible.
If not, what's the best place to do so from the driver's side footwell to the engine bay? This is for a 1992 E250.
I didn't end up finding any factory pass through wires but I used the handbrake cable grommet to pass my new wire through. The grommet is long but if you pull it out and keep pushing the new wire along the handbrake cable, slowly massaging it through, eventually it comes through