I had the same problem 1998 ford ranger. left headlight very dim. right head light worked normal. pull back for high beam flash left dim headlight would go out. put on high beems left light got even more dim. trouble shot wires and replaced blinker/high low beam/whiper unit didn't fix. replaced headlight didn't fix. looked at wireing harnes connecter that conects to headlight bulb and center (black Wire) female contacts was open more than the others. (was making weak contact (ground) FIX:::: SLIGHTLY BENT BLADE ON HEADLIGHT TO MAKE BETTER CONTACT WITH WIRE CONECTION WITH WIDER FEMALE CONTACT RECPTICAL. HEADLIGHTS BRIGHT AS EVER AGAIN. PS ALSO PUT DIELECTRIC GREASE IN CONTACTOR.
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To remove the front head light please follow the steps below:
Place the Ford Ranger in "Park." Turn the engine off. Turn the headlights off. Remove the key from the ignition. Allow the truck to cool for about 20 minutes.
Open the hood of the vehicle. Locate the two retainer pins on the headlight assembly of the light that needs to be replaced. Pry the retainer pins open with your finger. This releases the headlight assembly from the Ranger.
Pull the headlight assembly forward. Unplug the electrical connector from the back of the assembly by hand. Rotate the retaining ring counterclockwise and slide it off the plastic bulb base.
Pull the burned out bulb straight out of the headlight assembly. Discard the used bulb. Insert a replacement bulb into the headlight assembly and push it straight into the socket until it clicks into place. Slide the retaining ring around the bulb and rotate it clockwise to secure it.
Plug the electrical connector into the back of the unit. Slide the headlight assembly back into the Ranger. Push the retaining pins back down to secure the headlight assembly.
I believe headlights have a self resetting circuit breaker. Perhaps the headlight switch is bad, or the dimmer switch... both must work for headlights to work. Get a meter or test light and check to see where you're not getting power. I hope this helps.
THE SOLUTION WAS THE HEADLIGHT SWITCH. IT TURNS OUT THIS IS A COMMON PROBLEM ON THIS PARTICULAR MODEL. THE BROWN WIRE USUALLY BURNS UP. CHECK ALL WIRES AND CONTACTS BEHIND HEADLIGHT SWITCH. TO PULL SWITCH, THERE IS A RELEASE BUTTON ON THE BACK SIDE OF THE SWITCH. PRESS THAT BUTTON AND IT WILL REALES THE PLUNGER. PULL THE PLUNGER ALL THE WAY OUT AND YOU WILL BE ABLE TO PULL THE HEADLIGHT SWICH OUT. i JUST REPAIRED BROWN WIRE AND CLEANED CONTACT. VOILA.. RUNNING LIGHTS ARE NOW ON. THAT RELEASE BUTTON ON THE SWITCH IS A BOOG TO GET TO THO. GOOD LUCK
The only thing that all of your problems have in common is the light switch and the dash wiring harness. The stereo is linked to the light switch because of it's illumination feature' You need to test the light switch with a test light by probing the wires at it's plug.