Question about 2004 Mercury Sable
I recently had to replace the alternator and the battery still getting this code and P0622 code. Also the "check charging system" and battery light coming on. Had both battery and alternator tested several times now and neither are testing bad.
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Posted on Jan 02, 2017
This could be caused by a faulty voltage regulator, but since it has happened on more that one alternator, that can't be the problem, right? The next thing that I would look at would be a defective or loose belt. Also check the tensioner to make sure it is working properly and is keeping tension on the belt. If the belt is slipping or is worn out, it will cause voltage fluctuations. You may want to look at changing or at least inspecting the belt. Hope this helps and best wishes.
Posted on Aug 27, 2009
SOURCE: my battery light is on
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
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