Diagnos no charge message on 96 Eldorado

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Message appeared after charging battery on low for 2+ days. The car is not driven and started about once per month with the assistance of a battery charger as it had a bad battery. The system was ok one day and not the next. I put a good battery in the car and it started ok but did not eliminate the no charge message. I let it set overnight in 20 degree weather and the battery was still ok and started the car fine. The message was still there. I am seeking help to locate the source of the problem such as a fusable link etc. I believe the alternator to be ok and and would like to know if anyone has knowledge about the possible cause and location of the problem. I am in a remote area and cannot get the car to a repair shop. This vehicle is not been driven in a year and started about once a month. this problem popped up overnight. plumhole1