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Your headlights may not dim because you don't have dimmer lights. Dimmer lights can blow and leave you with just the high beams.
The headlamp switch controls the power to the dimmer switch and then on to the headlights.The headlamp switch controls the power to the dimmer switch and then on to the headlights.
POSSIBLY A LOOSE GROUND WIRE AT LEAST THAT IS WHAT I AM LOOKING FOR ON MINE,GOOD LUCK! The most likely cause on the late 80's Bronco & Ranger for headlight problems is the failure of the Dimmer switch connection. I had to completely replace the connector & switch on my '88 Bronco II to resolve the problem.
Dimmer switch is possibly defective
The dimmer switch is defective.
turn the dimmer up.
They as designed to "dim" when headlights are on to reduce "glare" try adjusting dash dimmer switch
Yes it could.
Dimmer switch controls the selection of either Hi-Beam or Low-Beam headlights
This is usually an indication that the dimmer switch is in need of replacement.
Bulbs? Fuses? Relay? Dimmer switch? Headlight switch?
The instruments light dim for night driving when the headlights are turned on. Check to insure that your dash dimmer switch is on high. If it is, then you have a problem with either the dimmer switch or the wiring.