Check Charging System light kept coming on. Battery good and alternator was good. Someone at Autozone said it was the fuse link since it happened to them and is common in this type of vehicle. 2 Dealerships said we needed the entire battery assembly. This was incorrect. The fuse link piece comes off the positive terminal and connects to the alternator. Anthony from Joe Meyers Ford in Houston TX was very helpful. He took his time to help us get the right part. I hope this will help somebody.