Problem with parking back lights on my school bus I changed all the fuses and nothing my headlights work reverse lights work

Hi Julie let's see what we can do here go back to the rear socket you have front parking lights yes/no if yes the the problem is either corrosion inside the socket or a wire is broken or the headlight or brake light switch so first let's do this turn on headlights see if all lights are on (parking tail headlights next change to just parking lights check again next use 4 way flashers and next use brake pedal there are 2 filaments in each bulb and you need to record when it's not working so EX.HEADLIGHTS PARKING LIGHTS ARE IN 1 FILAMENT ////BRAKE LIGHTS TURN SIGNALS AND 4 WAYS THE OTHER ONE IF AFTER CHECKING THERE IS STILL NOTHING ON THE LEFT SIDE AT ALL NOW IT'S A WIRE OR THE SOCKET IF THERE'S ALSO NO PARKING LIGHT IN THE FRONT IT'S THE SWITCH FOR THE HEADLIGHTS GET A GUY TO CHECK THE WIRE CONTINUITY OF THE TAIL LIGHT FROM THE HEADLIGHT SWITCH AND THE POWER COMING OUT FOR THE LEFT SIDE TAILIGHT AND CHECK THE BULB SOCKET FOR THE SAME CONTINUITY TO GROUND AND FOR 12 VOLTS YOU DIDN'T LIST WHAT VEHICLE THIS IS BUT THE PROCESS IS THE SAME A CORRODED LIGHT SOCKET MAY BE YOUR PROBLEM HERE WHEN YOU CHANGED THE BULB WAS IT BLACK AND CLOUDY LOOKING OR JUST CLOUDY WHITISH LOOKING WATER COULD BE GETTING INTO THE TAILIGHT CAUSING A SHORTING CONDITION AND COULD HAVE BURNED OUT THE SOCKET

These are all different circuits. The brake lights are on a 10amp fuse - the headlights are on a 50amp fuse - and the parking and dash lights are on a 20amp fuse.
Do you have power going into the headlight switch and the brake light switch ?

Check your fuses. I had the same problem with a 90 Honda civic. Dash lights went out, tail lights also went out. Replaced 1 fuse and all came back on.

check the head light fuses, check the headlight bulbs, check the grounds by the head lights. Verify that you have 12v getting to the bulbs by using a volt meter. maybe next time say what the year and model of the car is. I dont know if your working on a school bus or a yugo, but either way id start by checking fuses.

Check fuses and it's possible both of your headlights are burned out. They are the sealed beam type.

If the parking lights do not come on, they do have their own fuse, and it could be bad. This is separate from the brake lights.

But if the fuses are all good, then it could be the headlight switch. Remember the switch does the parking lights separate from the main headlights, so that you can just turn on the parking lights if you want, (Paris style). It is a feature left over from WWII, when Europeans were not allowed to run with full headlights at night, in the cities.

change the headlight switch!! itself its broken inside the unner contacts

look for the relay for the parking light

if u have change and check the bulbs and fuses. great. fuses do go lose in a cherokee . move each fuse by hand while the lights are on or the switch is in the on position. if you find the problem this way. just take the fuse out and slightly twist the prong of the fuse and replace it back and ditto. make your daughter say " u d grate dad"

I had the opposite problem on a 92 and 94 chevy trucks.I had park lights but no headlights and both were solved with switch itself.