Welcome to 2CarPros.
Hi Lisa. Honestly, the first thing I'm going to suggest is to check and make sure the battery terminals are clean and tight. Often times when you get one click, it is due to either corrosion or a loose terminal. I realize the battery is new, but are the terminals making good contact?
Let me know what you find with that and also, let me know if there were any prior issues before the battery was replaced.
https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked
Take care,
Joe
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Monday, July 15th, 2019 AT 8:27 PM