05 Ford Five Hundred charging system message?

05 Ford Five Hundred recently over night problems with the charging systems came up. The has a new (rebuilt) alternator and starter that were put in within the last 4 months. Battery is 18 months old (Motorcraft). All of the sudden on Monday freaking morning the dashboard has a message on it 'Check charging system', then the battery light comes on too. Here is the catch the car turns on and drives.

Took it to the repair shop that did the alternator. The man hooked up the tester to the battery to check the system. According to the tester everything is running fine. They will look into further this week. But what in the world would cause the message to come up and yet the car runs?

Why do Psychology graduates struggle to find work in the USA when the public sector is a key employer?

Given the high crime rate, can't they get jobs as Forensic or Clinical Psychologists in the Department of Corrections, various police departments or hospitals around the country?

Occupational Psychology is also in demand by key private companies such as Ford, Coca Cola, UPS, Chevron and South West Airlines.

Is one possible reason lack of interstate or regional mobility, that most people in Chicago would not apply and go after a job in Dallas?

High mileage +200k miles toyota camry or older lower mileage american car buick, ford thunderbird etc?

I'm looking for a used car an find most toyota camrys corollas 1999-2004 listing between 2k - 4500 but most have 190k or more miles an example is a 2004 camry with 220k miles for 4500 stickered an ready to go. I'm looking at older cars such as a buick century with 140k miles from the 80s for 1500 or a 1991 chrysler new yorker 5th avenue with 120k miles for 1200 dollars that drives. Would i be better off buying a old car an repairing it up myself as things break or buying the high mileage toyota car? Should i go with a older car thats got low mileage or a high mileage toyota