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one wire will for high beam
one wire will be for low beam
the last wire will be ground wire
as fog light have only one beam you can use the low beam wire and parallel wire it to the fog lights
that way you have the head lights still and the fog lights as accessories correctly wired according to regulations
how to do it simply-- find the low beam power wire ( light switch on low beam and power at the light bulb check ed with a multi meter set on volts
solder , piggy back, or double plug in a connection into that wire and run one wire to the left fog light and one to the right fog light connect each fog light to an individual ground wire and connect those wires back to the ground wire for the main lights
Now having done that simple addition to the lighting system another problem has come up
The wiring will now be too light to carry fog light current and or the light switch will burn out
To over come this problem, the circuit needs a relay
fit a relay on the bike and now run the low beam wire to a terminal of the relay
run the other terminal wire to ground
this enables the relay to operate when the low beam is switched on but at this will not switch on the lights yet
now you have to run a heavy gauge wire (fused at the battery) to one of the power terminals of the relay and from the other power terminal to the connection for the fog and low beam lights
Now it all works switch on the high beam and no for lights
change to low beam and the fog lights come on as well
All nice and legal
Of course if you don't care about being legal just buy a 30 amp toggle switch and run a fused wire directly to the switch from the battery to the lights and then to ground from the lights
You will know that the generator / alternator for the bike will not be able to run the fog lights with or without the main lights so what will you have achieved
Could your Mazda have daytime running lights? If you checked all fuses, did that include the three in the joint box?
There is an auto light-off control module that is central to all functions you describe. It is assumed that you would only turn on the fog lights with headlights on and set for high beam. If you set the headlight switch to LOW, the module closes the headlight relay to turn on the low beams. If you then turn the headlight switch to HIGH, the module turns on the high beams and allows you to turn on the FOG LIGHT switch, closing the fog light relay and turning on the fog lights. Since this sequence is not working, I suggest checking both high beam lamps as both could be burned out. Other possibilities are a defective headlight switch or the module
it is illegal in europe/japan for these foglights to work on anything BUT low beam.as the light spread from these would be defeated if main beam were on in foggy situations.in other words pointless having them switched on.you could always fit accesory spots/driving lights.(like rally cars)but these MUST only come on with high beam.(so you dont blind oncoming traffic.)
If high beams work and low beams do not, then it is probably the high/low relay. It is part number 15016745 and has four prongs. To test if your relay
has gone bad locate the relay in your fuse box. There will be two of these
relays located next to each other. One controls the low beam headlights
and the other the cooling fan. Swap the relays and check your low beam
headlights. If the low beams work you have a bad relay.