Three of my power windows stopped working with all the switches (1993 4Runner). I'm suspecting a fuse or a relay, but everything I've looked at checks out. Looking for any help thanks..

Check the master window switch

Sounds to me like a switch problem The master window switch should be checked. Also check the door switches to see if they are getting voltage. Could also be bad window motors. Tests need to be done. Is there power to the power seat switch?

You need to see a wiring diagram to see how the ignition switch allows or sends power to that 30 amp fuse. The switch may turn on a relay (maybe the ignition relay) that sends power to the fuse panel. Or the run wire out of the switch may itself turn power on at the fuses. You may have a loose connection behind the fuse panel.
Get a test light, pull the fuse, and check for power at the fuse terminals, with key on. One terminal for the fuse should have power. If not, power is lost between the ignition switch and that fuse. If it does have power, and windows still don't work, check the wire from fuse panel to the master switch-loose or poor connections, maybe a partially broken wire. If it looks good, check the ground wire for the windows. The ground wire originates at the master switch and will go back into the cabin to a nearby ground, possibly behind the left kick panel. If still no help, someone may need a volt- ohmmeter to start checking continuity of wires, voltage drops, etc.

If one tail light works, it's not the fuse box. It's either a ground wire off on that side , or a wire chafed along the curcuit. Your fuse for parking lights is for all four. If you have three, it's definately not the fuse box. You did not say what type of vehicle you have or I could have told you the best places to look for a ground wire. And I'd like to know if signal, brake, and reverse lights on that same side work at all. Let me know what your car is and we'll go from there. Please rate this solution thanks

Not sure but if it were me I'd check the wires going into my fuse box sounds like you've got wires arching Or your ignition switch has wires arching most likely it's your ignition switch. Not sure though

You should have power to the dash if the key switch is working.
The main fuse would kill everything in the car.
Depending on how it happened, I would check the fuses and then check for voltage at the key switch.

Window fuse's and relay's may be up under driver or passenger side dash or behind glove box, under the hood and even under the seats, and finally on the ends of the dash. All passenger power windows and locks are controlled thru and get power from the master control switch on the drivers door.

Drivers door window gets used the most so it could be the motor, window switch, relay or fuse.
Could also be a broken wire in the rubber boot going from the door to the body. You will have to eliminate each till you find the culprit. Check that all switches return to neutral when released.
The motor and the relay are the most likely to cause this problem. Try swapping the relay with a working window relay. If it still doesn't work, remove the door panel and remove the window motor.
Turn the motor shaft in both directions by hand several turns. Then plug the motor in and see if the switch will now run the motor. Sometimes that's all it takes to get it working again. I have had to do this with brand new motors. If voltage is not present at the motor connector, either a bad switch or a broken wire exists. Make sure to check for voltage coming to that windows switch. Actually, GM use's a circuit breaker type relay for each window and one fuse for all the circuit breakers.
Try this....
Open the door, turn the key to the ON position without starting the engine and everything that makes noise is off. Lean down placing your ears close to the bottom center of the door or at the speaker grill. Press the window switch UP and DOWN. Listen for the window motor. If heard the drive is damaged. If not heard, turn key off and locate and replace the relay with one of the other window relays. Check window again. If it works now, get a new relay. More often than not, removing the motor and turning it by hand will get it working good as new. I have had to do that with Brand New motors! So try it.
If all has failed, with the door panel still off, check for voltage at the motor connector when pushing the window switch. No voltage means its the switch, especially if its a auto down or up switch.

Window fuse's and relay's may be up under driver or passenger side dash or behind glove box, under the hood and even under the seats, and finally on the ends of the dash. All passenger power windows and locks are controlled thru and get power from the master control switch on the drivers door.

Drivers door window gets used the most so it could be the motor, window switch, relay or fuse.
Could also be a broken wire in the rubber boot going from the door to the body. You will have to eliminate each till you find the culprit. Check that all switches return to neutral when released.
The motor and the relay are the most likely to cause this problem. Try swapping the relay with a working window relay. If it still doesn't work, remove the door panel and remove the window motor.
Turn the motor shaft in both directions by hand several turns. Then plug the motor in and see if the switch will now run the motor. Sometimes that's all it takes to get it working again. I have had to do this with brand new motors. If voltage is not present at the motor connector, either a bad switch or a broken wire exists. Make sure to check for voltage coming to that windows switch. Actually, GM use's a circuit breaker type relay for each window and one fuse for all the circuit breakers.

Try this....
Open the door, turn the key to the ON position without starting the engine and everything that makes noise is off. Lean down placing your ears close to the bottom center of the door or at the speaker grill. Press the window switch UP and DOWN. Listen for the window motor. If heard the drive is damaged. If not heard, turn key off and locate and replace the relay with one of the other window relays. Check window again. If it works now, get a new relay. More often than not, removing the motor and turning it by hand will get it working good as new. I have had to do that with Brand New motors! So try it.
If all has failed, with the door panel still off, check for voltage at the motor connector when pushing the window switch. No voltage means its the switch, especially if its a auto down or up switch.

Check the master window control panel on the driver's door. There is probably a lockout switch. It may have a window outline on one end and the same outline with an "X" over it on the other. Press the outline without the "X" and all your windows should work again. As silly as that sounds, a lot people hit that switch without knowing it. Also, if that switch(lockout) is faulty, none of the windows will work. That happens A LOT!!

If the lockout switch on drivers door is "OFF"... Window fuse's and relay's may be up under passenger side dash or behind glove box.
Could also be a broken wire in the rubber boot going from the door to the body. You will have to eliminate each till you find the culprit.
The motor and the relay are the most likely to cause this problem. Try swapping the relay with a working window relay. If it still doesn't work, remove the door panel and remove the window motor.
Turn the motor shaft in both directions by hand several turns. Then plug the motor in and see if the switch will now run the motor. Sometimes thats all it takes to get it working again. I have had to do this with brand new motors. If voltage is not present at the motor connector, either a bad switch or a broken wire exsists. Make sure to check for voltage coming to that windows switch. Actually, GM use's a circuit breaker type relay for each window and one fuse for all the circuit breakers.

Dear kaydynandtri, If you have the owner's manual find the power window relay. They are usually located in the fuse box. Check to see if there is another relay that matches that one and switch places with them. If the windows work or the accessory the relay came from does not the relay is bad. If this does not work I would replace the driver's door power window switch. I have also seen the wire break on older cars where it goes into front of driver's door.