> So I take it that there's a relay for the rear fogs and one for the front
as well?

No.

There are two possibilities.

The german T3 are equipped with a rear fog light, or with both front and
rear foglights.

If only the rear is present, the wire from the headlight switch (pin "NSL")
goes directly to the fog switch (grey/yellow) and from there via the fuse to
the rear taillight assembly. No relay is used.

If also the front foglights are present, the grey/yellow wire is not
installed, but the relay is installed in pos.7 of the fuse block (see
previous posting).

So the headlight switch is always connected with pos7 of the fuse panel, but
this position is only equipped with a relay if front foglights are used.
Otherwise the relay is missing and the foglight switch is powered directly
by the headlight switch.

Raimund