First of all, the battery light never means that you have a bad battery. You COULD have a bad battery, but that is another issue apart from the battery light. The battery light means that the regulator in the alternator doesn't see a charge going to the battery. That doesn't mean you have a bad alternator either, but you could have a bad alternator. The light is turned on by the regulator which is built into the alternator. Just because you have had the alternator checked does not mean that it is good. For one thing, I have seen a lot of alternators that were working, but there was a problem with the regulator falsely turning on the light. Guess what? The fix is replace the alternator, since the regulator is part of the alternator. Also, it is possible that you have an intermittant problem in the alternator. That is consistant with the battery light going on and off. If the alternator is charging at times, and not charging at other times, it may just be that the alternator is bad but it was working at the time they checked it. Another possibilty is that you may have an intermittant problem in the wiring to the alternator. The alternator requires a field voltage supply to it in order to work. If the field goes away, the alternator stops charging. You could have a break in a wire going to the alternator that is making contact at times, and not at other times. Most likely that would be right at the alternator connector itself, that is where I usually find problems. There are two connectors, one has three wires, the other has one wire. Try tugging a little on each individual wire as it enters the connector hardshell, and see if you find a wire broken inside of the insulation.
I've seen cases where the belt was slipping on the alternator and the battery light would go on, then off. It was caused by a worn belt or the belt tensioner itself was bad. Check those things first before replacing an expensive alternator.
yes it will i have a optima battery in my 1995 marquis
If it sounds like it can't turn over and you've replaced the battery, the next thing is the Starter. Starters develope flat spots on them and that can drain a battery in a heartbeat, even a new one. I'd get your starter checked. H-T-H
Battery, fuel, spark.
Have the high pressure valve checked.
can the fuel injectors on a 1994 grand marquis be checked without removing them from the engine, if so what type of instrument do i use
The battery size for a 1987 Grand Marquis is a 4.6L. It is important to always check to make sure you have the correct size battery when you are replacing you battery..
Battery may have a dead cell and need replacing.
Make sure the air filter is clean. Fuel can't burn without air. Also try replacing the spark plugs.
Call a locksmith.
Check the fuel filter if the cars battery and alternator is good it might be the lack of fuel that is bogging the car down. My advice to you would be to check or replace the fuel filter.
You have to be more specific. What is not working?
Have the car checked at a wheel alignment shop.
The daytime running lights module on a 2000 Grand Marquis is located in the passenger side engine bay. It lays between the battery and the heater blower.
Bad Rings. Get your Rings replaced asap.
where the starter located on a 1997 grand marquis
The timing must be checked using a timing light. Most mechanics have one.
Its your bushings, they need to be replaced. About $200 at a shop.
Mercury Grand Marquis was created in 1983.
Just had my 2004 grand marquis convertor replaced (making an aweful noise). it cost me $250 for the part and then labor etc. total of bill for installing etc was $472.61.
The computer is detecting a malfuction. The next time the light comes on, do not unhook the battery, take the car and have it checked for codes. You want to repair the cause, not ignore it.
You have a bad sensor in one of the doors, all 4 will have to be checked. Check at you local dealer for the part. In the meantime, just pull all the bulbs out so as not to drain the battery.
Most likely the ac belt is loose and needs to be tightened or replaced.