The fuse at the battery may be something someone added themselves in addition to the one Sunline installed.
Sunline use to create a wooden connection box inside the camper up front on the older models. Where exactly depends on the floor plan. To find it, go under the camper and follow the heavy 7 wire cable that plugs into the truck and see where it goes up through the floor. Then go inside and find that location. I do not know you layout or the year of the camper to help look it up. What model year is it?
The box is often under a couch or in a cabinet on the floor. Take the wood cover off the top and in there should be 2 fuses. One for the truck charging fuse, the other to protect the battery and wiring.
There also should be fuses in the power converter. Have you looked there? To find the power converter, go outside and find the long shore power cable you plug into a 120 volt AC outlet. See where that cable goes into the camper. Then go inside and look in that area, the power converter/ fuse panel should not too far away.
Hope this helps
John
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Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
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