The "E" is to chassis, and thence to the positive terminal of the
battery.
The other 2 each provide the negative connection to the battery, one
from the switch, and the other from the battery directly (or via the
fuse block).
The switch powers the wipers constantly, moving them in the familiar
back and forth pattern. when you turn them off, the internal contacts of
the motor supply it with power from the battery connection until it
reaches the park position. The park position can be adjusted by rotating
the round part of the wiper mechanism. It contains the switch contacts.
You can determine the connections by just supplying power to one of the
terminals with the "E" connected to earth. if it runs constantly, you've
got the wiper switch connection. If it just move to one position and
stops, or doesn't run. you've got the battery connection.
The diagram you're looking at is probably from the TR2. I don't believe
early TR2 cars had parking wipers.
--
George Richardson
Wyvern - '57 Triumph TR3, TS15559LT -
http://www.merlingroupinc.com/tr3.htm
Griffin - '71 Triumph Stag - undergoing restoration
Kitty - '83 Jaguar XJ6 Vanden Plas - Daily Driver
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