There are some new wiring diagrams available on the MTFCI web site.
They cover the 19-27 cars with starters.
These new diagrams show the installation of the reproduction wire harnesses currently available from Model T suppliers.
There are diagrams for each of the wire harnesses as installed on the cars.
There is also a complete diagram for the 19-25 and the 26-27 cars showing the appropriate harnesses.
Check them out.
Here is the link :