I searched the forum for someone with same problem, but came up with nothing that seemed to discuss my problem.
I have a 2000 Rodeo 6 cylinder auto and air.
Today I was 275 miles from home and i cut off my rodeo. When i restarted it, i didn't notice anything. But as i pulled out of the parking lot headed home, i noticed that some accessories worked and others didn't.

Worked: headlights, fuel gauge, speedometer, tach, radio, wipers, cruise. interior lights, door lock.

DID NOT WORK: blinkers, electric windows, air conditioner, air conditioner blower, rear wiper, flashers.

Let me preface this by saying earlier in the week all window switches would operate the window they work on. But the Drivers master switch would not roll down the passenger front window but would roll it up, and it would roll down the driver rear window but would not roll it up. But the switch at each door would roll it up and down. Now nothing works anywhere.

When i noticed the accessories that would not work, i found a parts store and raised my hood. All the corresponding fuses in the panel by the driver door were good.
The a/c 10 amp fuse under the hood was burned out. I replaced and it has not burned out again, but the a/c still does not work. The flasher fuse was burned out and when replaced, it burned out again, signifying some short with flashers, which could affect blinkers, i suppose, but the blinkers flash when the key fob is used to unlock the doors. There is a (big black)relay in the top right corner of the inside drivers panel that is shown to be power windows and a 30 amp fuse with what looks like a resettable fuse link in the lower left corner of the box. I had the resettable fuse link tested and they said it was showing 2-3. They may be bad but all the parts stores here are closed.
I don't know why the a/c does not work. I swapped out the ac relays under the hood but nothing changes, it still did not work. It too was working fine when i turned off the car.
275 miles is a long way home, in the Georgia heat with no a/c, no windows rolled down and only the rear glass open for any time of cooling.
any help would be appreciated. Sorry post is so long, but tried to put out as much info at start to speed up process. Thanks for any help.

Have you ever replaced the Alt? the Battery?

Isuzu do funky things if the battery is shot, or the Alt is not putting out enough current at load (if may be fine at idle).

I would have the battery load tested and then have the alt load tested too.

Troubleshoot your charging system. I suppose Ryan adequately covered that, though...

When I had a bad alt, the blower fan didn't work. Headlights went dim. Interior lights worked. Radio worked. I didn't check the wipers, signals or A/C, though. Are the battery and brake lights on in the cluster?

If you have a trailer wireing harness try disconnecting it. They also do funky things to the electrical when they go bad.

I took it to the auto parts store and had battery and alternator checked. All checked out good. The guy there said it may be the Body Control Module going bad. I do not see that in Haynes manual, actually i'm at work and my wife doesnt see it. What can anyone tell ma about the BCM? Are there any relays or fuses in the wiring harness outside of the drivers door and black box under hood? My mechanic suggested ignition switch, but electrical is out of his expertise. Thanks for any help.

I talked to a service man with Isuzu of Valdosta, Ga. He told me that there is not a BCM on the 2000 Rodeo. He also informed me that there is a fuse in the box BC-16 on the schematic, a 15 amp fuse, that controls the a/c, blinkers, power windows, and the rear wiper. So i started pulling every 15 amp fuse in the box. The 15-amp fuse for the electronic ignition was blown. I was looking for fuses that dealt with a/c, turn signals, rear wiper and power windows. My wife said replace every fuse in the box, next time I will listen to her, no more riding about 250 miles with no a/c and no windows to roll down. I thought the electronic ignition would control the starting of the vehicle, not select convenience devices. Oh well, hope this helps someone in the future. Check every fuse in the box, no matter what it says it controls. Thanks for everyones help.

Thanks for posting your solution!

I'll add this to the FAQ's.

My 2000 Passport has the EXACT same problem. However, when I replace the fuse it pops again within minutes. ...at random times, of course, so there's no way to figure what's causing it.
Did you have any lingering problems with the fuses?