I pretty much thought so. I went back out after I posted and looked at possible areas that would have one but none to be found.
I looked closer at the fuse panel and I have another 20 amp fuse for heated holding tanks and I'm almost sure that I don't have tank heaters. "No switches on the panel to turn them on".
I think it's a generic fuse panel and somebody plugged fuses into it where they probably were empty slots before.
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