Question about 1987 Mercury Grand Marquis

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I have a 1987 grand marquis. I need to make sure i put the positive wiring for the battery in the in the correct spot.

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The positive is the red wire the negative is black , they are also marked + for popsitive and - for negative. if they are not marked properly make sure thet the positive one goes to the starter or solenoid and alternator , just follows the wires back

Posted on Oct 07, 2009

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Putting aftermarket radio in 1997 ford Mercury grand marquis but wire color doesn't match up... what colors do I use for speakers and battery and ground


Get your self a D or C battery fully charge. Set aside the cables that you think it goes to the speakers. Now grab a pair of cables that you think it goes to one speaker, it don't matter if it's from, back, right or left, we are going to figure that out with the battery. Grab on of the cable, if you think the cable goes to the positive, connect the cable to positive (battery) and the other one just tap the bottom of the battery, you should hear a thump sound. Now you know to which speaker those cable belong to, but you need to be sure which is negative and which is positive. For that, take out the door carpet, or wherever the speaker's at, and expose the speaker, try again with the battery, if the thump sound makes the speaker go in, you need to swap the cables, if it goes out, you have them correct. Best of luck.

Feb 06, 2015 | 1997 Mercury Grand Marquis

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I need to replace my computer in my 1987 Mercury Grand Marquis


Are you sure-- they don't fail unless someone
ruins them with improper testing

Have you had every possible component test done,
to resolve whatever is the problem?

Mar 06, 2013 | 1987 Mercury Grand Marquis

1 Answer

On a 1987 grand marquis 5.0 litre,what causes battery to drain energy even after replacing with new battery,new solenoid and had the alternator checked and it is good.car started fine and drove around for...


most of the time if the alternator isnt the cause of the battery not recharging after initial start up then it is most likely a wireing problem you may have a short some were causing the alternator to disperse the charging volt else were... check for damaged, loose, or disconnected wires under the hood.. good luck i hope this helps

Feb 07, 2011 | 1987 Mercury Grand Marquis

1 Answer

My windsheild wipers keep getting stuck in the middle position when i turn them off


When a wiper motor does this it usually needs to be replaced. The Park circuit is not working. You may be able to see a ground wire on the motor beneath one of the mounting bolts. If you do find a wire, try cleaning the connection and bolting it down again and it may work.

There are contact points inside the case which are suppose to derail the wiper gear and put the wiper on a shut-off cam. When the cam finds the ground wire it parks the blades at the correct spot. In your case the motor is not finding the correct spot. Cleaning the ground wire may help.

Depending on the construction of the motor casing, you may be able to WD40 the inside of the gearbox. It may or may not help.

I hope you found my solution informative and helpful.

Dec 11, 2010 | 2000 Mercury Grand Marquis

1 Answer

Need to know where to put the brake fluid in 1987 mercury grand marquis please help!


open the hood and right in front of the window glass area driver side is the MASTER CYLINDER.
Open the master cylinder and fill as needed with the proper fluid ...or..take it to a relative or friend or the Auto parts store and have them help you.

Sep 30, 2010 | 1987 Mercury Grand Marquis

2 Answers

I am unable to turn the key in the ignition of my 87 Mercury Grand Marquis. The steering wheel is not locked. I think the tumblers are miss aligned. I bought a new Lock cylinder but can't get out the old...


Make sure the gear selector is fully in the park position. If it is not, you will not be able to turn the key to the position that locks the steering. This is by design, so that if someone has to turn the key off because of a runaway engine, they don't inadvertently lock the steering.

Jun 26, 2010 | 1987 Mercury Grand Marquis

1 Answer

Wiring diagram for 1983 grand marquis alternator


i found out that it grounds when u put it on the car so u dont need to hook anything to the ground connection. the power goes to the bigger connection. the feild is usually the longer wire of the 2 wires that are left. the third goes to the sta spot

Nov 13, 2009 | 1983 Mercury Grand Marquis

1 Answer

My car wont start


first have to ask if you are sure that you connected the wires to the new solenoid just like they were on the old one. don't mean to say that you don't know what you are doing, i would be asking myself the same question at this point. if you are certain that you did then try cleaning the battery terminals. take the negative terminal off first, that way you won't generate sparks like you might if you took pos off first. clean up both posts and clamps and wipe the crud off the top of the battery case, use some baking soda on it if there is a lot of oxidation and deposited junk on the battery, it neutralizes the acid residue. if you are not sure that about the integrity of your battery, test it or have it tested. symptoms you describe would be consistent with dead battery. if battery is good and posts and case are clean, then make sure the wires that carry power to the starter and the ground from battery to frame are good. visually inspect both wires, look for frayed spots, breaks in insulation, oxidation at connectors, stuff like that. you can do all this while the battery is disconnected, that's a good time to do it if you are going to take connections loose and clean them up. if all that is good then i have to ask why did you replace the solenoid, and maybe why not the starter too. if the car wasn't starting before you did that maybe whatever was preventing it from starting is still preventing it from starting. hope that helps

May 29, 2009 | 1987 Mercury Grand Marquis

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