1992 Ranger, 3.0L, V6, manual trans. When I turn on the headlights switch I only get parking lights. I can hold my high beam flash-to-pass switch but if I just turn on the high beams I get nothing. I have no power coming from the switch to the headlights but my Haynes manual doesn't have a wiring diagram for my truck so I can't isolate the fault location without it taking all day.
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Re: headlights and highbeams switches
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.
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you might just have two bad low beam headlights, I have seen it before. Only other problem would be the switch that turns on the headlights is bad. Best way is to Test power going into the headlight when the low beams are turned on to rule out the switch.
If your Highbeam Switch is on your streering colum (turn signal lever) Thats where I would start too look! It could be the wires to the highbeam switch. I had that happen on my ford. But if the highbeam switch is on the floor, check for a bad circut connection and if that checks ok it might be your main headlight switch! Even though you may not loose your highbeams, your main headlight power still runs through that highbeam switch, and being on the colum thats why the would start to function when you move the shifter.
If your high beams come on only when you hold the lever, and you have no headlights otherwise, i would suggest it has to be the dimmer switch that is faulty. First, though, use a test light to see if you have power to the low beams. Just pull the bulb out, and test in the socket. If you have power there, the problem is just the bulbs. No... they didn't both burn out at once, but you don't notice until they are both gone. You meet cars all the time with one headlight. When the second one goes, they over think the problem.
The fact that your dimmer switch has to be held to get any headlights would lead me to believe it's the dimmer switch that is faulty.
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