1999 Mercury Mystique Repair Question
Mileage: 112,000 miles.
Battery light is on alternator and battery tested good. What is causing this?
Answer
so when did this happen first? any changes made by you just before?
It been on for awhile now. I have had it in to a mechanic and a couple of other places and they say everything is ok. I also think there is nothing wrong with the alternator and I think it is something with the wiring going from the alternator to the instrument cluster. According to the wiring diagram in the manual i have there is a wire going from the alternator regulator (green and black) going to the instrument cluster the other one from that connector of the regulator is going to the battery. I was going to try and trace the green and black wire from the alternator to the instrument cluster and put a multimeter on it to see if its broken somewhere.
yes, that seems like a logical choice.
Hi guys. Here's a quick test. Unplug the voltage regulator connector, then look to see if the warning light is off. If it's not, that green wire is grounded and the generator shouldn't even be turning on as the current coming through the light is the turn-on signal. If the light does go out, suspect the regulator. Once the system is up and running, it puts 12 volts back onto that green wire to turn the light off. It knows to do that when half of system voltage appears on the white wire that's plugged into the side of the generator.
Most auto parts stores that test generators only look for output. Many do not test the warning light circuit.