Actually the motorhomes have a number of these and they are called mega fuses. They come in different shapes and often have different covers on them, making them hard for us as rookies to see them as a point to go bad but one of the bigger problems is it gives two additional points for corrosion. We often look at the battery posts and fail to look all along the path from point A to B.
https://www.grainger.com/product/42V...E&gclsrc=aw.ds
One thing we can say is that fuses rarely repair themselves but corrosion can come and go, makiong contact one day and not another!
No way to know for sure but since it was intermit. and the tech just took the old out and added a new, that clears the corrosion off the ends! The question is whether they tested for bad connections or only tested for power getting through that point!
One of the problems I have seen when taking things to repair, they tend to replace boards when it may actually have only been corroded connections!
They get paid better for finding bad boards than they do for bad connections--- and it is easier!
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Richard
Why no RV year, make and floorplan on MY signature as we suggest for others?
I currently DO NOT have one!