Question about 1987 Lincoln Mark VII

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Need wire diagram for headlight dimmer switch

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Posted on Mar 31, 2015

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1986 dodge w150(power ram) headlight stuck on high beams. Also having trouble with passenger headlight not working. Already replaced Hi/Low dimmer switch.

Have you checked the relay in the circuit. You really need a schematic of the wiring diagram. Electrical can be tricky without the wiring diagram.

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No regular fuse for headlamps , fusible link .Do you know what a fusible link is ? There is a headlamp switch , dimmer switch , no relay . Go free wiring diagrams ! Check it out yourself , an check for B+ voltage with a DVOM - digital volt ohm meter at the headlamp switch , if B+ voltage is present there check at dimmer switch . There are videos on youtube for basic automotive electrical testing . Do you know how to read a wiring diagram ? Videos on youtube for that as well .

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When you pull the switch to you that is flash to pass . Did you check fuse's ? There is a headlamp relay that could be bad or the dimmer switch could be bad . You can find a wiring diagram at Use wiring diagram to test for B+ voltage at headlamp switch , dimmer switch an also check ground circuit . If you find B+ voltage going into the switch but not out , there is your problem .

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Re Clarion radio screen brightness, I have retro fitted the radio to another vehicle but the wiring diagram doesn't mention a dimmer. Do I need to hook one of the wires into the headlights?

One of the wires on the radio is for the brightness. Connect this wire to one of the dash lights that dim with the dimmer control or the headlight switch dimmer if your vehicle is equipped that way.

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1 Answer

Location of the headlight relay.

Has no headlight relay ! your headlamps not working ? high or low ? You have a headlamp switch an a dimmer switch for low or high beams ! The main light switch should have battery + voltage all the time .You can go to free wiring diagrams ! Shows fuse's , connectors an wires at main light switch an dimmer switch ! Suggest you go on youtube an watch a few videos on electrical circuit testing an how to read a wiring diagram ! Pull the main light switch out of the dash an test for B+ voltage an test at the dimmer switch too. Test the whole circuit !

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1988 GMC Van headlights cut off when I tilt steering wheel.

You need to check the wires in the steering column. Take the column cover off, probably phillips-head screws, so you can see the wires. Somewhere the tilting function is putting pressure on the wires to the dimmer switch. It may be pulling loose a connection, just a fraction, to lose contact. You may also need a new dimmer switch. Or a multifunction switch if the dimmer switch is attached that way. The headlight switch is on the dash, isn't it? If it is, the headlight switch is not the problem, it is the wires in the steering column or the dimmer switch. If the dimmer switch fails, you will have no high or low beams, no head lights at all.

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Wiring diagram for a 1994 olds cutlass supreme instrument lights

Power comes from headlamp / dimmer switch . Go here for free wiring diagrams Enter vehicle info year ,make , model ,engine size ! Under system click on lighting then under subsystem click interior light dimming .

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1 Answer

Head lights one works other not then other works and then not

You may need a wiring diagram to troubleshoot this. In past years the headlights were grounded at the light and the headlight switch provided power.
On your car, the headlights get power from a fuse for each side. The body computer, headlight switch, and dimmer switch all provide the ground for each side. The relays are grounded by the body computer and headlight switch.
If you have power at both headlights at the same time, I would say the problem is in the dimmer switch, the body computer, or the wiring. Somewhere a ground connection is failing.

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All lights work on my 83 cj7 except my dash lights

You either have the headlight dimmer control turned off or the dimmer control rheostat is defective

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I would take a look at your headlight dimmer switch. The dimmer switch works independent of the DRL system.
Below is the wiring diagram for you vehicle.
Good luck and let me know.



Apr 06, 2009 | 1996 Chevrolet S-10 Pickup

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