This could be a loose plug at the alternator or dirty connections from corrosion or the belt tensioner has become weak and is not holding the belt firmly so it is slipping on the alternator pulley look at it while someone raises the rpm's quick bursts of gas pedal will make the tensioner flop around loosely instead of slow moving from acceleration it should only slightly move bit ,also check that the alternator is pushing at least 14volt out if it if there isn't enough you have a blown diode from jump starting another car with the cables connected battery to battery
Altinator is not charging properly
SOURCE: 1996 Mercury Sable LS. Problem: Dome light and
have you checked to make sure the dimmer switch isn't turned all the way up? if the dimmer is turned all the way up it will keep the lights inside the car on. check the dimmer switch
SOURCE: 2000 MERCURY SABLE
My 2000 Sable starts blowing hot air about every 6 months. I mean like an oven. All I do is disconnect the battery negative terminal for about 5 minutes. After I re-connect the problem is solved. This solves many problems on this car, it just needs a re-boot. It must be powered by Microsoft (ha ha). Good luck. ps my auto headlamps never did work right either. Dave.
SOURCE: battery light stays on--- alternator and battery
May have blown the fuse or connections to alternator may be poor.
SOURCE: 2001 mercury sable will not charge and the battery
Ensure the safety of the Battery charger first , and let me know pleas .
SOURCE: charging system light on 2002 Mercury Sable
If the light is on there is a problem in the charging system, possibly a defective diode inside the alternator rectifier.
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