For the TR2-3A the wiring is so simple that I've always prefered the factory diagrams which are a true physical representation (rather than a logical diagram used for more complex systems and modern cars.
If youve never seen one... on the TR2-3A diagram the headlights are where the headlights are on the car, taillights at the other end, dash just like it looks from the drivers seat, etc.
Only problem with the factory diagrams is that they always seemed to use RHD cars for examples.