When making changes to a car, it is important to have a diagram. For this car, a wiring diagram can be found in the cars' maintenance manual bought at auto stores.
For the chassis, you would have to contact the chassis manufacturer. For the body, you would have to contact the body builder. There isn't one universal wiring diagram for all school buses.
autozone.com
autozone.com go to repair guides chassis electrical and than wiring diagram find the stereo vawla there you go
yes have both engine and chassis wiring in my workshop manual , can be reached at egood7@live.jp
autozone.com, or Google search with the heading Isuzu wiring diagrams. autozone has a printable version for both chassis and engine control
Scion XA wiring diagram is a drawing and information. In the wiring diagram it shows how to work the wiring.
Go to you local public library and ask them for the books on it.
General Motors released a yearly manual of wiring diagrams for the P-30 chassis. For example, the 1992 manual was entitled "1992 Electrical Diagrams and Diagnosis Manual Light Duty Forward Control Chassis, Value Van, and Motorhome Chassis Models". The GM document number for the 1992 manual was X-9240. They are sometimes available on EBay
radio wiring diagram
A wiring diagram for a buyang 110cc
You can order a wiring diagram from the dealer, I believe it is about $50- $60, there is no beter wiring diagram than a factory diagram
A pioneer wiring diagram will show wiring placement for the installation of the stereo and the speakers. This diagram is included with the purchase of the stereo.