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Ford Crown Victoria/Mercury Grand Marquis Electrical/Lighting

122 messages,  Last post on Nov 05, 2009 at 5:55 PM

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What is this discussion about? Ford Crown Victoria, Mercury Grand Marquis, Lights, Electrical, Sedan

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#93 of 122 1998 Grand Marquis 4.6l v8 by bozemanmahlon1 Feb 06, 2009 (4:47 pm)
The 98 GM starts to turn over for a split second and then dies. Good battery, new tensioner assembly and starter. Prior to not working, sometimes it would sound rough and choking when starting but a tap on the gas and it would stop (after fired-off) and run and idle fine. I have power at the alternator, the starter relay and relays and fuses are good (except no continuity on the EEC diode, dont know if it should have continuity anyway). When attempt to crank the battery voltage drops from 11.9 volts to 6.2 volts. Can you replace the voltage regulator or do i have to replace the alternator or is something else wrong??
#94 of 122 Re: 84 Crown Vic electrical [gearhead11] by gearhead11 Feb 08, 2009 (5:50 pm)
Replying to: gearhead11 (Feb 05, 2009 9:45 am) I replaced the headlight switch and lights still come on. There are supposed to be two relays under the dash some where that one has to be bad but I can't locate them Replies to this message: euphonium (Feb 08, 2009 8:04 pm)
#95 of 122 Re: 84 Crown Vic electrical [gearhead11] by euphonium Feb 08, 2009 (8:04 pm)
Replying to: gearhead11 (Feb 08, 2009 5:50 pm) Fuses under the dash and Relays are under the hood. Maybe near the coolant reservoir.
#96 of 122 PCM Failure with lost of data link by racprops Feb 22, 2009 (3:29 pm)
Has anyone had a PCM totaly shut down and take the data link with it.   All fuzes and power check good even to the PCM and even the power to the ODB2, but no scanner will read and the car will not run.   Starter spins it nicely but no run.   Rich
#97 of 122 PCM Dead with data link gone too by racprops Feb 22, 2009 (5:20 pm)
Has anyone had a PCM totaly shut down and take the data link with it.   Was driving on I 10 doing 65MPH and blam.    All fuses and power check good even to the PCM and even the power to the ODB2, but no scanner will read and the car will not run.   Had to tow it home.    Starter spins it nicely but no run.    Rich   Sorry about double post the page numbers run backwards to most forums, most keep the first page #1 and the older post slip lower and on to page 2 and so on.
#98 of 122 Re: head light go 2004 crown vic. [jerrygw3] by houselight Feb 26, 2009 (6:54 pm)
Replying to: jerrygw3 (May 05, 2008 8:25 pm) I am currently having problems with my 2004 Mercury Grand Marquis with the head lights not coming on or going out. All other light stay on. Turning the light switch on / off and it won't come on. Same symptoms in auto or manual Headlight mode. If I stop the car it will come back on. It then might go off after a while. I see others have had this same problem with the Ford but I have note seen any answers.   Fred Replies to this message: gearhead11 (Feb 27, 2009 7:31 am) houselight (Mar 09, 2009 8:58 am) markeez (Apr 23, 2009 6:47 pm)
#99 of 122 Re: head light go 2004 crown vic. [houselight] by gearhead11 Feb 27, 2009 (7:31 am)
Replying to: houselight (Feb 26, 2009 6:54 pm) I have an 84 crown vic and my headlights would come on and I couldn't get them to go off. Ireplaced the headlight switch and didn't help. There was a relay under the radio behind the ashtray center of dash. I removed it and took care of the problem. My auto delay doesn't work but I can live without that. Also you might have a light sensor on top of dash by windshield that could be defective. Hope this helps. Replies to this message: houselight (Mar 09, 2009 8:58 am) markeez (Apr 23, 2009 6:47 pm)
#100 of 122 Re: head light go 2004 crown vic. [gearhead11] by houselight Mar 09, 2009 (8:58 am)
Replying to: gearhead11 (Feb 27, 2009 7:31 am) The Lighting Control Processor had to be replaced. It is located inside the auto behind the glove box. If any one else has the problem they should tap on it to see if they can re-create the problem. That is how it was discovered. The problem might not appear when you want it too. It also might make the lights go back on when they go off. It is very costly but the headlights now work properly and do not go out any longer.   Fred Replies to this message: markeez (Apr 23, 2009 6:47 pm)
#101 of 122 Headlights posessed by molarmo Mar 29, 2009 (8:53 am)
My "03 marquis has headlight issues. They go on automatically, but intermittently go off. When they go off, I'm unable to get them back on even if I turn the light switch on manually. When they do come back on I hear a "click". There seems to be no pattern..........very frustrating. Dealership is useless. Can anyone help????? Replies to this message: gearhead11 (Mar 29, 2009 5:12 pm)
#102 of 122 Re: Headlights posessed [molarmo] by gearhead11 Mar 29, 2009 (5:12 pm)
Replying to: molarmo (Mar 29, 2009 8:53 am) I have a 84 crown vic and my headlights would come on automatically also. I'm not familiar with 03 marquis but my problem was the auto lamp relay. I replace the headlight switch since it has a delay built in but didn't fix it. You also may have a sensor on top of your dash which detects sunlight and darkness which could have something to do with it.

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