Headlights do not work, side lights do, main beam does and fog lights do

find the low beam light relays
by law the fog lights can only come on with low beam
using fog lights on high beam is *******

It would be easier to find clues to the fault using a circuit diagram.

There are slight differences how the fog lights are wired and generally are intended to be used only with dipped headlights but for exact operational details the vehicle handbook should be consulted.
You didn't mention what the rear lights including the rear fog lights are doing?

The fog lights usually derive the supply or the control for the circuit from the main lighting circuit so it would seem the fault is before the point in the lighting circuit of that connection.

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

Did you check fuse # F2.7 in the central junction box ? This fuse powers the main light switch an the MFS an the headlamp fuses ! Does your truck have auto lights ?

Could be burn out,check fuse.

either main fuses under bonnet 60 amp for each side ir the light switch faulty ,also fuse in the interior fuse box but would have to blow around 6 all at same time so check the other first

is located under the dashboard on the driver's side. The fuse label is attached under the steering column. If something electrical in your vehicle stops working, check for a blown fuse first. Below table outlines detail fuse number, its ampere and circuits protected.
No.
Amps
Circuits Protected
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38
7.5 15 10 7.5 (15) (20) _ 10 7.5 7.5 10 10 10 7.5 7.5 10 10 20 15 7.5 20 _ _ (20) 20 20 (20) 15 15 20 (15) 20 20 7.5 7.5 10 7.5 30
Power Window Relay Fuel Pump ACG ABS/VSA Heated Seats* Front Fog Lights* Not used Rear Wiper ODS (Occupant Detection System) Meter SRS Right Headlight High Beam Left Headlight High Beam Small Light (Interior) Small Light (Exterior) Right Headlight Low Beam Left Headlight Low Beam Main Headlight High Beam Small Lights MAIN TPMS Headlight Low Beam Not used Not used Moonroof* Door Lock Front Left Power Window HAC Option Rear Accessory Socket Accessory Front Right Power Window Accessory Power Socket on the Center Table* Rear Right Power Window Rear Left power window ACC Radio ACC Key lock HAC Daytime Running Lights Front Wiper

check the bulbs first and also the fuses theres a fuse for each side and for low and high beams, start there, good luck.

Probably not, the fog lamp relay works off the dip beam power, is there a relay for the dip beams?