The trickiest thing with replacing the switches is removing them from the
American dashboard. Electrically it is a doddle if you move one wire at a
time to the correct replacement switch, but the hazard usually has a multi-way
plug and the fan and map-light switches only have two wires, so even that
isn't an issue with those switches. But why are you replacing them? They
aren't cheap, replacement parts are rarely these days as good as the
originals, and won't last as long. That is if you don't get a faulty one to
begin with. The usual reason for working on the switches en masse is the
painted logo/writing having worn off, but it is possible to redo that with a
tyre marker or some-such.
Adding a fog light needs more thought. Is it/are they already mounted? If
not mounting position is the first thing to consider. Electrically, both
front and rear fog lights should only come on if the main lighting switch is
itself on, in either its first or second position. It would be folly to
simply power the fog light off the parking light circuit directly, even if
there is only one light, the added current will be bad news for the main
lighting switch. You should take a wire off the parking light circuit at the
main lighting switch (red wire), via an in-line fuse, and the fog-light on-off
switch (with tell-tale lamp), to a relay, the other side of the relay winding
being connected to ground. The relay contact should then be fed from the
brown circuit, via an in-line fuse, and then wired to the light(s). Bring the
ground wire back from the lights to the grounding bolt near the fusebox. You
can find a schematic at http://www.mgb-stuff.org.uk/wn_electricsframe.htm and
click on 'Lighting' and 'Fog and Spot Lights'.
PaulH.
----- Original Message -----
I'm thinking of replacing my switches this winter, as well as adding a fog
light switch
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