I recently did this. based on some TR4s I looked at... the switch does go
on the right side of the nacelle. I made a (sorta) D-shaped hole to accept
it. You will probably find the switch provided has a flat spot on one side
of the threaded portion, hence the shape of the hole.
The switch typically provided is not the correct one for a TR4 -- it has a
black (rather than chrome) stalk and is somewhat angled. I found that
mounting it with 'up is off' orientation causes it to angle back from the
wheel and thus reduces the possibility of accidently flicking it in a turn.
I believe the relay is mounted above the tunnel, along the lower edge of the
battery box. There were exact measurements of the location in one of the
manuals (probably Bentley/factory) for dealers adding OD aftermarket.
Geo
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