OK - I see an error right away, either in your installation concept, or your
explanation. You said that when you flick "the switch", the park lights
work, but the fog lights do not. This suggests that you WANT them to
activate simultaneously, which is wrong. Fog lights should function
independently from your normal car lights for more than one reason. They are
a driving tool for certain driving situations. They are not cool. They
should not be on at all times, especially since most home-brewed
installations result in their being aligned incorrectly, which makes other
drivers want to kill you.

Disconnect all components and start over again. If the instructions tell you
to mingle the wiring with that of the park light system, the instructions
are wrong. What do they really say?

You should listen to Joe, he knows absolutely nothing about cars but
he *is* very accustomed to other drivers (in fact, practically
*everyone* around him) wanting to kill him.

A bad ground is often the culprit in electrical problems. An easy way
to test your ground is to use a 12v test light. Good luck.
jor

Judging from your address, I assume you are in New Zealand, and I am not
aware of the regulations regarding the use of fog lights there.  In the
U.S., Toyotas are wired so that the fog lights can only be activated with
the low beam headlights on, and are de-activated when the high beam
headlights are in use.

If you have a 12 volt test light or volt meter, check to see if power is
coming to the fog light sockets.  If power is coming to the sockets, check
the ground for the sockets and the bulbs themselves.

As far as how you have wired your lights, assuming that you want a simple
setup that is independent of the operation of the other lights, the easiest
way to wire would be to have power coming from the fused side of a switched
power source in the fuse box to the switch, and then from the switch to the
relay, and then wire the switched side of the relay directly to the battery.

a budget multi-meter would be helpful but I can testify and blush
about a problem I had. The switch was one of the lighted type and I
picked the wrong terminals running the power to the driving lites
thru the light in the switch ... which doesn't work. You might try
starting with that if a lighted switch.

Check that you have a good ground. If possible, ground them to the same
point as the relay.

I assume you mean the park lights come on normally but you can't get the
fog lights to work.

For the switch you want the following.

Wire from the park light to the switch then to terminal 85 of the relay,
then from terminal 86 to earth.

For the lights.

Wire from the battery positive to a fuse, to terminal 30 of the relay,
then from terminal 87 to the lights, the from the lights to the earth.

If you have any problems I would look at earth points as these need to
be bare metal connections to work properly.