Question about 1992 Mercury Grand Marquis

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Headlights go from hi to low beam by themselves

If i turn my headlites on in the dark within 1 minute they start changing from hi beam to low beam at a rapid pace

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Hi, There is a short in the wiring to and from the switch. Check wiring.
Look in diagram on Manual. Could be also a bad ground. Good luck.

Posted on Oct 29, 2012

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Posted on Jan 02, 2017

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SOURCE: Headlights suddenly turn off

check your lo beam headlight relay sounds like its overheating

Posted on Aug 15, 2008

juncro
  • 467 Answers

SOURCE: 99 mercury couger-all headlights not working

check the fuses and relay that control the headlights

Posted on Jul 13, 2009

  • 7353 Answers

SOURCE: my headlights will not turn on

could be either headlight switch or hi-lo beam switch. ck all fuses first.

Posted on Oct 02, 2009

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2 Answers

NO LOW BEAM HEADLITES FUSES GOOD BULBS GOOD


this could be a bad ground. Check all connectors for burns or loose conections and go ahead and change the fuses. they may appear to be good and be bad.

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Low Beam Drivers Side doesn't work ... low voltage,


Power for the headlights on the Left side (High and low beam.) comes from the same fuse... The ORANGE wire and the ORANGE/BLACK are the same, they connect in the harness. If you only lack the 12v to make the light work connect them at the headlight assembly.

If your low beam also lacks ground the Left low beam ground is shared with the right low beam ground... Run a wire from left low beam DARK BLUE to right low beam DARK BLUE/WHITE.

If its not working now then your cursed, seek a witch doctor.

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You know the fuse for the high beams is good ( Cab fuse panel fuse # 16 ) and the pass low beam fuse ( cab fuse panel # 26 ).
Might want to check cab fuse panel fuse #28 ( this is the driver's side low beam ).

If this fuse has power on both sides ( with the low beams on ) next you can pull the headlamps, and check for power at the connectors, but depending when the last bulb change took place, I would say you need need bulbs. ( need at least 1 for the high beam out )
Confirming with a meter at the headlamp would be a good idea, before spending the money.

The bulb connector has 3 pins.
Black wire is ground on both sides
Light Green w/ Black stripe wire is high beams on both sides
Driver Lo = Dark Blue w/ white stripe
Pass Lo = Dark Green w/ Orange stripe.


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Probably bad ground connections, clean & recheck headlights!

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u most likely have a high beam relay stuck or dimmer switch is messed up

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i work in a garage and i can say chevy is junk, we get 10 chevys to 1-2 other car makes your best bet is to not tell any one about the problem and sell it, im not favoring any vehicle makers but thats the way it is sorry

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It sounds like your switch has burnt out . You will need to remove the steering wheel and steering cowlings to remove and check the switches . Regarsd VW Audi Tech

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