Hazard Light & Horn of my izusu crosswind does not work at all, whats wrong?

Question edited for clarity, 'fuse', unless you light it 'fuze'.Question moved to sub category.

If the radio has an inline fuse, it will be within 82 of the plug at the rear. They are built into the harness. Unlikely because there are three fuses covering audio.

https://fuse-box.info/isuzu/isuzu-trooper-1992-2002-fuses-and-relays

C11 10 (AUDIO[ACC]) MIRROR Audio, Door mirror, Door mirror control SW, Door mirror folding SW, Digital clock, Speaker C12 20 CIGARETTE Cigarette lighter C13 10 ANTI THEFT Anti-theft controller C14 15 STOP A/T CONT Stoplight SW (w/o cruise control), Brake SW (w/cruise control), Rear wheel anti-lock brake controller, Stoplight, Transmission control module, Electronic brake control module, Trailer harness connector, Cruise control unit, A/T shift lock control unit, Lockup off relay C15 20 AUDIO[BJ] Horn, Horn relay, Horn SW, Hazard warning light SW, Flasher unit, Anti-theft horn, Hazard warning light, Audio C15 20 TELEPHONE Telephone C16 10 CLOCK[B] ROOM Digital clock, Audio, Dome light, Map light, Luggage room light, Courtesy light, Door SW (Front, rear, tail gate), Antenna, Anti-theft controller, Key remind SW, Seat belt, Key & light remind buzzer

What exactly is wrong with it? Start with the basics. Check the fuse. I think on that model the horn and hazard lights were on the same fuse so test your hazard lights are working. Check the wiring and connections are clean and shiny at the horn sounder itself. If you know how to use a multimeter you can check for signal from the switch with a helper pushing the horn button.

All except the brakes sound like fuses failing, or wires breaking. A quick check of the fuse box should remedy those.

What do you mean by "the brakes"?

does the pedal go to the floor without stopping the truck?
do the brake lights not come on?
is the brake indicator on the dash on?

need a little more to go on

Sounds like a switch failure or a loose wire near the switch. A short wold have caused the fuse to blow. Remove the cover over the steering column and check the wiring

look in owners manual in dash for fuses and relay locations it sound like fuse and relay problem

Not necessarily, horn fuses are pretty heavy, about three times the hazard light fuse, but that may vary on vehicles. Check the fuses though. The fuse must be in the main fuse box. The position and function of the fuses is normally marked on the inside of the fuse box cover and also in the owner's handbook. If you don't come right with these, work your way through the fuses looking for a blown one. To ease your search the hazard light fuse should be around 10 to 15 amps. If that is not the problem, check the switch and the hazard light flasher unit.

there could be a horn relay bad, if your car is so equiped or the horn button could be bad. wiring could be bad or the horn itself. if you can jumper 12 volts from the battery to the horn, you can eliminate the horn.

Check the flasher & horn relay.Have no idea where they would be on your car.

Hazard warning lights and horn on a 2006 Ford KA don't work but indicators do

Here are the numbers on your fuseblock and fuses coresponding to the number that is on your fuse block.
1-20 amp (yellow)
Hazard flasher
2-10 amp (red)
back up lights, A/C clutch cycling Switch
3-30 amp (green)
Power windows
4-30 amp (yellow)
A/C or heater blower motor
5-20 amp (yellow)
Panel Lights, Side marker lights, Park, Taillights, Clock & radio display Intensity, License & panel lights.
#6-10 amp (red)
Stoplight, buzzers, Anti-lock brake module
#7-15 amp (lt. Blue)
Tachometer, horn & Relay
#8-8 amp (yellow)
Power Door locks
#9-10 amp (red)
Radio
#10-10 amp (red)
Rear Wheel Anti-lock module, Turn Signals
#11-20 amp (Yellow)
Windshield wiper & washers
#12-15 amp ( LT. Blue)
Cigarette Lighter
#13-5 amp (tan)
Speed Control, warning buzzers, gauges, indicator lights
#14-5 amp (tan)
Time/delay relay & under-hood light, dome light, power mirrors, readio & clock Memory, Interior lights, reading lights
#15-blank
Not used
#16-4 amp (pink)
Radio Lights & overdrive switch light 1989-91, Cluster lights, Cigarette Lighter light & as tray light, Cluster lights, A/C & heater controls.
#17-relay
Hazard Flasher warning
#18-relay
Relay
#19-Circuit breaker
#20-relay
Turn signal Flasher
#21-buzzer
Warning
#22-Relay
Horn