I have a 1990 chevy where the headlights, tailights,interior lights, and radio does not work and have checked all the fuses and they are all good what can the problem be?

sounds like you need to run through all your fuses with a multimeter

check fuse panel first for blown fuse,second check your daytime running lights come on without flickering. if problem persists- all these are affected by headlight switch- controls interior lighting and headlamps and daytime driving lights

Check your timing belt, and check for a spark from your spark plugs. Check your fuses to ensure that none are blown.

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Sounds as if you may have a short did you check the bulbs? I would check the bulbs and make sure they are good. when you lift the rear hatch lid search around the wires and see if you have a exposed wire or perhaps a loose wire connection. Allot of times wires in a vehicle that year start getting frayed and worn from putting different items in the rear of the vehicle.

The headlight switch is common to all your problems except the quick flash of the turn lights on one side the quick flash is usally a bad bulb as the tailights have two and one could be out and it'll still work just it changes the flash quicker with no load too little and it'll not blink just stay on. Theres fuses for the dash lights but the tailight fuse has to be good for it to get power. Any crash damaged lights need to be checked out as water getting into the sockets can mke a problem. The marker lights on the front do'nt work either. Fuse or headlight switch now remember that the radio has a light in it too and if someones changed the radio alot of aftermarkey readios don't use the run light as they are on withthe radio on and this wire may be touchin ground or be hooked up wrong at the lights the wire color is brown. It's highly unlikly that alot of bulbs failed at one but the car is old. Start with fuses and if the tail fuse is blown and it has an odd radio pull it disconnect it and try another fuse

Nissans like most all cars and light trucks made for sale in north America the taillights dont work either if the dash lights are out. Tailights work go to next step, or fix tailights (parking lights) The fuse blown for the parking lights can happen at the radio and is common problem with aftermarket radios hooked up wrong. If The car has an after market radio and the fuse for dash or tail is blown I check the radio first unplug and look for loose bare or untaped wires see if a new fuse holds with the radio hang and then unplugged. Always use the right fuse as the headlight switch can't take a bigger load and you may not find the problem till you have a fire. The tailights are next if their out I just unplug the wire from the light fixtures and try a new fuse if the dash works now with it on plug the tailights in one at a time and watch operation If the bright light (brake bulb comes on the bulb is in backwards ( see it all the time ) or doesnt light at all or dash goes back out fuse blows again You found your bad light and the bulb the socket are suspect. with it apart You can see the problem. Lets say the tailights work just right. and the dash lights still don't work. Theres a dimmer for the dash lights that can fail. its' a thumb knob deal that pops right out of the dash with a light pry and will hang by its wire ( 3 ) with the lights on two wires will be on if only two wires both will be hot cold with the lights off. if it has aground wire its because it lights up too. the grong wire is black. Connect the other two wires together or if two wires connect them and the dash lights up you have a bad switch. You can plug in a bebt paper clip tape over and reinstall or order up a new one from Nissan as the parts stores mostly don't have these. Call with your VIN and the parts guys are more friendly. Still no good. The headlight switch can fail but you'll say the tails don't work and the fuses are good and they were good when you checked them. With the covers removed from the steering colum the turn signal head light switch can be removed. Most of the time they fail after big fuses were added or lots of miles and tailight or radio problems. Most always created by a wrongly directed repair. Find the wire thats the same color as the wire you saw on the back of the dimmer switch for the panel and with a test light see if it comes on ( switch removed but hanging by the wire and the wire plugged in ) With the switch turned off two or three wires will be hot turn the parking lights on only and one more will come hot ( check with test light ) turn the lights on bright another wre comes hot switch to dim another wire comes hot and the one that was hot on bright goes dead the other two wires are the turn signals they need to work before your done as long as the lights work OK don't go diging into sonething thats not broke. Key off two wire hot one more with the key on (turn signal) if not good here your back to checking fuses The front lights can also short out as the car may have hit something. all the marker lights ( edge of the headlight ) Sides of the front and rear fenders and all the lights in both tailights are suspect. Last the wires that go to the lights are damaged somewhere. Theres lots of bulbs in the dash, glove box, ash tray, Speedometer, heater control and console gearshift. The likely hood of all being blown is unlikely. Power put on the panel dimmer switch will find out.

check the fuseable links at the solenoid for power both ends,maybe replace the headlight switch

the connection to the light adjustment knob thats imbeded in your dash. the one that adjusts the intensity of your dash lights and such probably came loose or detached.

possibly the dimmer switch on the floor? happened on my 91 half ton dims didnt work but brights did and then they cut out altogether. a little water goes a long way

did you take a look at your back lights too? cause if the interior lights are not working when headlights are on, then your rear lights will not work, only the brake lights will. Chances are you have a shortage, check your 10 am fuse for tailight and make sure it's not blown. if you put another one in and it still blows, then you have to find out where your are getting a shortage. chances are it's your side marker lights where your front bumper is, so check that first, i had a similar problem.