I'm not good at electrical things and electrical diagnosis. I had a John Deer tractor at work with the same symptoms as yours. Alternator/battery tested good, but the system did not charge the battery. After lots of digging, I discovered a bad relay in the electrical circuit and remembered that earlier I had a broken light wire that shorted out and blew a fuse (maybe the relay cause???). $80 part from John Deere.....$30 part from a Subaru dealer!.....yes, I googled the OEM part number and discovered it is used on Subarus also.
When time permits, I will query my factory service manual and see if it offers diagnostic help.
EDIT: A quick peek at my service manual shows that the charging circuit is controlled by both the TIPM and PCM (power control module), with the PCM monitoring the charge circuits for the most part. The PCM "should" store a DTC (diagnostic trouble code) readable with an OBD code reader. That should "begin" to tell you where to look. But, the manual does say to check the easy things first: battery, alternator/decoupler pulley, fuses, belt, ground and other wires, before doing the OBD. And, it emphasizes that the OBD code(s) are a symptom, not necessarily the cause. It will not tell you which component of a circuit is bad.
I'm also going to continue preaching to you cheap azz guys to invest in a factory service manual. pre 2011 ones are available for download on ebay for $7 and newer models can be had from a Canadian source for about $90.....will pay for itself with one repair, and all the correct specs (torque, etc.) are at your finger tips.
And, to milspectees who says "Stop guessing and take the car to an auto electrician": if a person has a diy mentality, there is nothing wrong with spending some time to educate oneself on repair procedures in order to be more self reliant. There is a learning curve and sometimes "throwing parts" at a problem before proper diagnosis does cost some money. But, you learn from mistakes and in later years you can save significant $$ (sometimes not) by diying. I learned appliance repair just studying the internet and saved numerous dryers, refrigerators, and washers with simple <$50 dollar repairs. Calling a technician and spending $300 is not cost effective on today's throw away appliances. To each his own. Spend time, money, and/or both to get the results.
2014 Sport, 2wd, 2.4L, 6 speed tranny, Winter Chill
Last edited by Treegrower; 06-07-2016 at 11:43 AM.