I don't think that you will find any diagram of that nature. Most electric wiring is field cut and doesn't have wiring diagrams unless it is a factor home, prefabricated home or a mobile home. I don't think that any of these types of houses were built in the 1920's. The good news is that any trained electrician should be able to complete this task without a diagram.
You can do this easily if you buy ceiling speakers. These are often ceiling or wall speakers. You should take care to avoid electrical wiring while installing.
electrical wiring diagram
When changing anything electrical in a car, it is important to have a diagram. An electrical wiring diagram for this car can be found in the maintenance manual.
A wiring diagram is a detailed diagram of each circuit installation showing all the wiring, connectors terminal boards, and electrical or electrical componets of the circuits.
Try MOTORLIT.COM for a wiring diagram.
Make sure that you have the correct wiring that you need and then follow the wiring diagram that came with your lights. You may also need to decide on the best place to place your motion sensor if you have that type of lighting.
http://www.wiringdiagrams21.com/1997-honda-xr400r-electrical-wiring-diagram/
Electrical wiring on a 96 vulcan 1500
dummy ceiling made to fix suitable light fixtures & hide electrical wiring .
No idea what a direct online motor is but it certainly sounds like a peice of electrical engineering - especially if there is a wiring diagram of it.
I need a Electrical Wiring Diagram for a Toro 15-44HXL Lawn Tractor
A wiring diagram is a diagram showing how to wire certain electrical components, in this case it would be the Pioneer DEH-4400.