The alternator went in my car and I was in a rush to get it fixed. When I called to see if they had the part they checked their stock and told me to bring the old part in so they could check it for me. They put it on their machine as soon as I arrived and confirmed that the old alternator was bad. The knowledgeable sales staff helped me get the correct part for my car and at the best price in Frederick. I couldn't have been happier. Repeat customer for sure.