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Re: headlights on my 2000 ranger
Very unlikely that its the switch, disconnect the connector of the bad light use a 12v test light to check for voltage at the headlight, One cavity is Ground and one is HIgh and one is low beam if all have the correct power make sure that the Ground is good both in the connector and where it connects to the body even if you have to fabricate a "new" gound wire temporally to test. Please rate this advice a fixya if you find it helpful and contact me if you need further help on this problem
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Check your head light bulbs, your truck has the dual filiment headlight bulbs one per side which does both high beam and low beam, 9007 bulbs.
If the low beam filiments are burned out only the high beam will work.
Also look into finding out if the headlight switch is gone bad.
The headlight module and or drl module maybe defective.
Check the fuse. There are seperate fuses for right and left. You dont mention if the high beam works for that side? If it does, the fuse is good. The GREEN wire at the bulb is the ground for the low beam. If that wire has power, then the ground is bad. If the high beam works, the hi'lo beam switch is good, and there is a problem between that headlight and the Engine Compartment Junction Block
After reading your post, I am pretty sure the headlight switch is at fault. What happens when you turn the headlight switch to on and then actuate the high beam switch? If both low and high elements light up, I think that would be the headlight switch itself as the culprit. I don't have access to the wiring diagram you need, as that would answer your question end the guesswork on my part.
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.