Typically it means you should start saving for a new alternator. One of the not so rare engineering flaws on this generation Cougar is the alternator, which will die due to poor factory wiring fairly often. There are mods to fix this problem, and Ford Lincoln Mercury dealers will see instructions to change the wiring of the alternator to be like that of the '01 and '02 Cougar2s when they go to change the Alt, not all alternator shops will necessarily know this is an issue.
If you take this on yourself, know this, the after market (ie motocraft) alternators for the Cougar are not nearly as reliable as the genuine Ford OEM product. And also, even if you take the alternator to have it checked at pep-boys or such, it will probably show that it is still good while it is indeed the issue.
I have what looks like a battery light on my dashboard. What does this mean?
disconnect the negative battery cable for 60 seconds then re-connect should do it
I was looking at the 1999 Mercury Cougar Owner Guide and it does not show that it has a gas cap warning light
On a 2000 Mercury Cougar : That's your Anti-theft system status light
disconect the battery cables for a couple of miniutes. that should do it. At Least 10 Minutes for battery disconnect
usually that the battery isn't taking a charge. have the alternator checked, many shops will test the charging system for free
You need an oil change.
You are low on coolant.
This happened to me on a road trip in my 84 Cougar. It was a long time ago, but first make sure your belts are tight! But I believe you may need to replace the alternator. If the battery is old, its cheap insurance to do both.
my light went off when i put a new gas cap on and unhooked the battery 10 min too reset
it is located on the light a switch that says 12sec on and off
go to a auto parts store like advance auto and have them check your computer to see why it is on. they do this for free. this might give you a idea on why its on. if you havent already.