Koons Ford Baltimore

2005 F-150, took for test drive, heard strange noise that lasted less than a minute, no lights appeared so I just thought is was the wind. Bought the truck and drove it home, no problems. Next day I drive the truck, makes the noise again, battery gauge needle goes up past 3/4 mark and battery light comes on. Took to a mechanic and he said the alternator was overcharging the battery and needed to be replaced. THEY SOLD ME A TRUCK WITH A BAD ALTERNATOR. I wanted to take it to the nearest ford dealership to have it replaced but they forced me to come ALL THE WAY back up to Baltimore (I live on the Eastern Shore) to have it fixed. Terrible customer service. THEY JUST WANT TO TAKE YOUR MONEY AND BE DONE WITH YOU!!! DO NOT BUY FROM THEM. I will never again.