I could use some help with proper routing of some of the wiring on my 1931 Coach.  Am hoping that this group can teach me what is correct.

1. The factory wiring diagram shows one terminal of the dome light switch being grounded. The switch is mounted on the car’s wooden “B” pillar so it must go to a metal ground point somewhere. Should the grounded wire go up to the vehicle roof or down to the chassis or elsewhere?
2. The wires going to the tail light pass through an armored sleeve somewhere along the way. I am guessing the sleeve protects the wiring where it exits the frame rail and passes through the underside of the rear fender.  Correct? How is the sleeve attached to the fender and frame rail?
3. The wires going to the horn likewise pass through an armored sleeve from the radiator shell to the “pancake” horn. The horn I have (looks original but may be for some other model) has no socket or bracket to connect to the sleeve, just two screw terminals. How does the sleeve attach to the horn?

Thanks for sharing your expertise!

Tom Fowler  VCCA #5898