Have a 2005 Mercury Mariner Premier, 108k miles, 3.0L engine. Was driving last week and the ABS light came on. Then slowly the dashboard lights dimmed to black and lost electricity. All this within a couple miles of driving.
Limped home and tested the battery - dead. Recharged and tested the next morning - still fully charged. Put another known good battery in and drove about an hour out and on the way home same thing happened. I suspect the alternator, but on testing, the alternator is pushing 14.3 volts on a good battery.
My fear now is the tear down necessary to change the alternator if it is not actually bad. Anything else I should look for / test before I start pulling the alternator out? Any other tests of the alternator that I can do while it’s still installed?
Any help is appreciated!