Question about 1999 Mercury Sable

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My battery light is on my dash. losing power while driving. radio shuts off lights go dim wipers start moving on their own. then car goes dead. once u get a jump starts up. replaced starter alternator and battery. all used though. alternator test fine out of car but in car not. battery test good. what could it be?

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  • missjones29 Oct 02, 2010

    is the voltage regulator on the alternator or seperate on this car? where is the or what is the vehicle circuit? don"t know much bout cars and this going on for 2 weeks now!

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  • Master
  • 435 Answers

Sounds like your voltage regulator is acting up, and at times will not let alternator voltage reach the circuit. At this point car stars drawing on battery alone (triggering battery light) and working until it is out of juice. Before you buy a new voltage regulator, make sure that its contact points on the alternator, and the plug from it to the vehicle circuit is clean, shiny and making good contact. These parts, due to their location tend to collect dirt and moisture, leading to an intermittent performance before they stop working completely.

Posted on Oct 02, 2010

  • missjones29 Oct 02, 2010

    is the voltage regulator on the alternator in this car or seperate? where is the or what is the vehicle circuit? don"t know much bout cars and this being going on for 2 weeks now!

  • Carlos Jaen Oct 03, 2010

    Voltage regulator is screwed to the back of the alternator, and it draws the raw electricity from the alternator with two spring loaded brushes. the bottom end of these brushes should look clean, as if treated with sandpaper. If they look blackish / burned or worn down to the spring holder, replace. The connector on the face of the regulator sends "corrected" voltage to the the main electrical circuit of the car. Its job is to insure that the vehicle never receives more than 14 volts or so. When they fail, they can either send NO voltage to car, lower than required voltage, or simply pass whatever voltage the alternator is producing, burning lights and causing other problems. Have in mind that being an electrical component, when these units fail,they work intermittently, sometimes working alright when cold, and failing when hot, or viceversa.

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