I have a 1997 Mercury Sable and the low voltage light came on. I checked the voltage on the battery and sure enough the battery was not charging. I removed the alternator and had it checked, dead, so I replaced the alternator and the battery. The low voltage light went out but the alternator is not charging the battery. The voltage before start is 12.7 and after I start the car the battery voltage drops to 12.3. I have checked the wires for corrosion and shorts but I see nothing wrong. I checked the voltage coming out of the alternator at the terminal point (wire with bolt) and it is showing 12.3. Any ideas?
Sunday, August 28th, 2011 AT 5:11 PM