Intermittent operation of interior fan - isuzu kb/trooper

The key lock cylinder operates the ignition switch sometimes ignition switch is separate sorry I didn't find where ignition switch is located if the lock cylinder is plugged into it.
You should have a starter relay and starter relay fuse.
This diagram of starter circuit shows the clutch pedal switch in the circuit on an automatic should have the neutral safety switch in the circuit. This is for 95 Rodeo.
Stater Motor Circuit Diagram (1995-1997 2.6L Isuzu Rodeo) (easyautodiagnostics.com)

How do I remove the key ignition cylinder? ' Isuzu SUV Forum (planetisuzoo.com)
Isuzu Trooper Ignition Switch Replacement ' Cost & Service ' RepairSmith
Changing the Ignition Lock: Changing the Ignition Lock, Safley ... (2carpros.com)
Starter and solenoid
Isuzu Trooper Starter replace under 1 Hour - YouTube
Isuzu Trooper (1995 - 1996) - fuse box diagram - Auto Genius
Starting System & Wiring Diagram - YouTube

Hi. Thanks for your question. For any assistance on indicator lights on Isuzu KB 250dteq you can visit https://www.reliable-store.com and download the entire workshop manual which includes all the information along with the diagrams for better understanding. Good day!

you blew a fuse.
and is caused by a short, need exact fuse to work branch.
SOP

Check engine temperature, fan operation and thermostat.
Also check inside blower operation. If intermittent, then check and/or change the blower motor.

Motor bushings have worn out or leaves of foreign object is on blower fan. You will need to replace the blower motor

if the lower fan speeds dont work but the fastest speed does the heater fan resistor block needs replacing. If the highest fan speed doesnt work leave it on there and check for power at heater blower fan, if power is on one wire and the other is an earth the blower motor fan needs replacing. Use a normal globe test light to check this. If no power on any wires to fan go back and check all fuses in car and under bonnet with same test light. If fuses are ok possible open circuit wire to fan.

Check under your hood for a second fuse box.This box should contain fuses and relays.Some times the box lid will tell you whats what ie.horn relay,fuel pump relay,ect.Look to see for a relay for your sunroof.Your sun roof takes a lot of power to run and should be on a relay.Your light and clock be on the same relay.Good luck.

i hate to say it but your blower motor is out

check the fuses for the fan. could be a blown fan motor, bad switch...or maybe water heater core bad, hot water valve bad, disconnected heater lines in the engine compartment... all possiblitlies

1989 Isuzu Trooper 2.6 5 speed. 4x4 jumps in gear by itself. 4x4 shifter is pulled hard back and held there but on highways it will jump back into gear. Have to stop and back up to unlock automatic hubs. Any suggestions?