Whilst it is normal (but not essential) to only enable driving/spot lights
when main beam is selected, fog lights need to be enabled when only parking
lights are on. If you can't have fog lights on unless either dipped or main
beam are on the glare thrown back by the headlights makes the fog lights
useless.
FWIW you can find schematics for the MGB here
http://www.mgb-stuff.org.uk/wn_electricsframe.htm
and click on 'Lighting' and 'Fog and Spot Lights'. Relays and fuses are
also essential if you have uprated headlights, see 'Uprated Headlamps' in
the same section.
PaulH.
----- Original Message -----
> The relay can be driven by the headlight circuit through a switch. Make
> sure
> you tap the high beam lead to the headlights so they will only work with
> the
> high beams on.
>
> I plan to install both fog and driving lights this summer, and already
> have
> the relays, one for fog, and one for driving, already installed. They
> will
> be controlled by a single pole double throw switch with the center switch
> position off.
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