hi- in my '72 overlander, the negative 50-amp fuse is located next to the univolt, at the end of the black cable coming out of the univolt. It is a little hard to get to, not much room for fingers to grab the fuse to inspect it. It's in a fuse holder screwed to the plywood platform the univolt is also screwed to. According to my manual, it is an AGU 50. I got some spare fuses from Fuseone.com. -tim
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