A7 WIRING DIAGRAMS 1922 - 1938
We are fortunate that Austin
took the time to produce not only Handbooks but also Parts Books of their cars
and within the handbooks include wiring diagrams. These wiring diagrams
developed over time as did the cars. The table on the next page lists all the
wiring diagrams available for Austin Seven cars and how they changed (this is
based on the handbooks available from the A7A Archive as of the date 11 May
2020).
I have then compared the handbook diagrams with the
diagrams in a number of Austin Seven books and was curious why there are 13
different diagrams in the handbooks but only 5 in Woodrow Manual, 5 in the A7
Companion and 8 in the Source Book so the table also compares these diagrams
with ones in the handbook. Some of the diagrams have probably not been included
in these publications due to space and some of the changes like a change in
starter motor does not impact on the diagram too much. But some of the
publications have labelled a diagram for a specific year but often covers a
number of years or in the case of a late RP with indicators and stoplight do not
have the diagram. Some of the changes are very obvious and easy to interpret
e.g. the addition of or change in starter motor. But some of the changes are
more complex and having the correct diagram for your car may save a lot time and
of confusion.
With the Ruby cars 1934-1939 there are three handbook
wiring diagrams, these have been amalgamated in John Cornforths wiring diagram
on our web site.
But please note that over time your car may have been
rewired or modified so use as a guide.
Douglas Alderson DA7C