I have a 99 Mercury Mystique that has a battery light on the dash. I have done the following so far. I have tested the battery and that is good. I have tested the alternator by taking it to a parts store. I am also getting 14.3 volts at the battery with everything that I can think of on in the car. I have checked the connections and clean them up as best I could with a wire brush on the battery terminals and all wiring connections. I have check the main 175 amp fuse with multimeter and that checks out ok. I have check the 15 amp fuse in the engine compartment and that is ok. I have check for shorts by having the negative battery terminal off the battery and using a test light one end hooked up to the negative post and the other to the terminal and the light didn't light. So that tells me that nothing is running off the battery and taking power. The only think I can think of doing to make that stupid light to go off would be to unplug the bulb for it. Any suggestions would be greatly appreciated.
Monday, February 6th, 2012 AT 5:00 PM