It was the right alternator we drove across country and back it worked fine
Here is the rest of the story. I use a small diesel shop for my repairs, when they finished my coach they went on vacation texted me my coach was ready and where I could find my keys. Picked it up and a week later took our short trip to the coast and the alternator failed again after about 50 miles. When I returned home I had my bill in the mail with explanation of work. Sent alternator in for repair under warranty, manufacturer repaired but they think my house batteries are bad or there is short somewhere so they will not repair again, information I wish I had before my trip. I will replace my house batteries and have my alternator rebuilt. Question is how do I check to make sure there isn’t a short somewhere before I take it out again