I can tell you that on a 2000 Mercury Cougar it is a fuse on the positive cable between the battery and the alternator
The charging system is the alternator which is on and functioning anytime the engine is running. If not, then you have a problem with the alternator.
There isn't any fuse then is linked to the alternator on a 1996 Mercury cougar. The alternator has an internal regulator, but does not have a fuse.
You can replace the alternator on your 1989 Mercury Cougar by removing the alternator belt. Disconnect the wiring harness from the back of the alternator. Remove the alternator retaining bolts. Reverse the process to install the new alternator.
embedded with alternator
If the bearings in the alternator get bad enough it can lock up.
It should be the same as for a 2002 Mercury Cougar which is answered in WikiAnswer under the Question; " How to remove alternator from a 2002 Mercury Cougar 2.5L V6." The 2000 Cougar may be different by having an upper alternator BOLT. If it does, and you can't lift the bolt out (after fully loosening the bolt), lower the alternator and you can, then, lift the bolt out. When you begin to install the alternator (attach the power wire, and the wire connector) place the BOLT in the upper hole in the alternator, and THEN, raise the alternator to install.
usually that the battery isn't taking a charge. have the alternator checked, many shops will test the charging system for free
front of engine at top on right side facing engine
wires, connecters, terminals
The Mega Fuse is located from the alternator to the back of the engine, under the air filter.
Faceing the engine.move to the left side of your car. Looking inside and down.Find your belt.Follow the belt and your alternator should be below it.
if it is a 2.5 v6 than take the passenger front tire off and the alternator is right behind the plastic shroud