"Andy Burns" wrote in message
...
NY wrote:

Andy Burns wrote:

bert wrote:

switch off vehicle rear fog but leave on trailer fog.

I thought the 7 pin sockets had been doing that with an inbuilt switch
for
decades?

The 7-pin (as opposed to 13-pin) socket doesn't have a pin that is
dedicated
for use by foglights.

This was donkeys year ago, with twin 7 pin sockets (one grey, one black)

Yes, I was referring to the single 7-pin socket, as opposed to the later
twin 7-pin sockets or the even later 13-pin.

Is 13-pin now the standard - do all new trailers/caravans/bike racks now
come with a 13-pin plug? When we bought our new car a couple of years ago,
we got them to fit a 7-pin socket because our old bike rack had a 7-pin
plug. We should have planned ahead and got them to fit a 13-pin socket and
buy an adaptor, given that we've since bought a new, better bike rack with a
13-pin plug (and had to buy the converse adaptor).

Going back to the earlier point, were some cars' 7-pin sockets fitted with
switch which disabled the car's fog (and maybe reversing) lights when they
sensed a plug in the socket? I bet you had to keep the socket clean to avoid
that switch getting gunged up.