Question about 1999 Mercury Sable

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Low voltage out of replaced alternator

I have a 99 merc sable sedan 3.0 v6 vulcan engine. Factory alternator went out 2 days ago and I installed reman alt from Oreilly auto. Chked voltage output and was getting 12.1V at fuse panel. Lasted 1 day then went south, Oreilly checked, bad diodes. Bought new alt, only getting 11.1V output. Cant figure out problem, should be simple, could it be another bad NEW alt? Should I try a different store?

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  • Anonymous Mar 26, 2014

    MY ALTERNATOR WENT BAD ON MY GENERATOR AND IT IS NOT MADE ANY MORE AND THERE ARE NO PARTS TO BE HAD

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Possible to have bought a bad alternator.... Try another one..Take advantage of the warranty the bad one came with....But have them check the voltage output on the new one so you KNOW for sure....Also consider issues with your voltage regulator and the possibility of needing a replacement. They are relatively inexpensive so that is the good news....More serious issue that could be addressed is a short somewhere in the harness. I would recommend a full electrical diagnostic to make sure there is not a bad ground....If you'd rather not spend a lot, just check all the wires you can visually.....But keep in mind that the voltage regulator is key and you do not want to spike the computer with inconsistent power levels and surges.

Posted on May 13, 2009

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