Headlights won't come on when I turn on the switch
The car has 240,000miles, when car is running, I turn on the headlight switch, no lights come on. Turn signals work, 4-way flashers work, high beam flash on when turnsignal lever is pulled and the interior lights on when door is open. Haynes manual calls out a headlight relay under dash location, but I can't find anything there. Swapped the silver relay near the battery with a relay known to be good, nothing happened. Is there another relays that is located somewhere else and whe I jiggle the headlight switch and cycle it off and on, nothing happeneds.
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Re: headlights won't come on when I turn on the switch
I am working on my 85 DL right now and got a few surprises when I went behind the dash - someone had been there before and moved a few things. I've owned the car for 21 years so it happened quite a while ago. I pulled my instrument cluster out along with the headlight switch. I suggest that you pull the headlight switch, ( a screwdriver removes the cover, after you've pulled the switch knob off with a good, steady tug on it.) Check for a loose connection. I found that Volvo and Haynes can't agree on the location of the relays so get a part number from the dealer for the headlight relay and then get started looking under the dash, especially under the middle A/C vents for the one you seek. I also found one hidden on the driver's side at the bottom of the center pedestal. It's black if that helps any.
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Might these be "driving lights"? Cars with "driving lights" have lights that are supposed to stay on all the time the engine is running. These lights not only look like headlights, in fact some cars even have the headlights themselves come on when the engine is running. Look as some more (several) 2002 Grand Marquis's and see if they are the same. Be blessed.
I have a 2003 GMC Sierra Z71 Extended Cab and the headlight switch won't turn off the headlights while the truck is running. When I got the truck the Photocell Sensor which is the black bubble that sits on the dash that tells the daytime running lights to turn off and on was down in the dash so I fished it out with my fingers and clipped it back in and it made the daytime running lights work. I still can't turn my headlights off while my truck is running though. The owner's manual says that I am able to do so. There's 2 light's on the switch by AUTO and the O for off that should light up? Is it my whole switch?
Probably need to replace your headlight switch, it could be another problem but that is where I would start. The headlight switch is 2 or 3 switches in one, it turns on your parking lights, it turns on your interior lights and dims them too. Either that or it's your bulbs but they say you will never burn both headlights out at the same time. If you have a test light or a volt meter you could check the voltage at the headlight, that would eliminate the switch.
Sounds like you have a problem in your headlight switch. As far as them staying on sometimes when you shut the car off are you referring to daytime running lamps or the regular headlights? If it's daytime running lamps that like to stay on and your headlights do not like to turn on then there could be a combination of headlight switch and daytime running lamp relay.
It is possible the relay gets the signal from the headlight switch as well, since they generally turn off when you turn your headlights on.
Sounds like a bum relay in the main underhood fuse box. My complete illustrated tutorial for repairing this $80.00 part is here: http://www.customsaab.com/Custom_Saab_NG900_OG9-3_Performance_Articles/p2_articleid/24
hello i would check the headlight switch most likely the internal contacts in the switch is most likely worn when you turn your lights on internaly the tabs cross to make the contacts to light your lights parkinglights one position,running lights another position i would change the switch goodluck please rate