When was it last charged
These devices should be charged once a month, every month even when not used
The batteries self discharge
does it light up and indicate plugged in when you try to charge it
if so, then most likely the battery
Battery gone bad is the most likely problem
Open it up and replace the battery
i don't belive there is charge only fuse
but should be a power in fuse, inside for the 120v line
maybe a 12v fuse in the 12v charge cable plug
I can explain it to you.
But I Can Not understand it for you !
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1997 F53 Bounder 36s