30 amp fuse for what? Attached to the positive battery post, most of us have a fuse holder capable of carrying 20 amps, a label saying, "Don't exceed a 15 amp fuse," and actually a 10 amp fuse inside the holder. It works fine. Of course, the purpose of the fuse is to keep the wires from burning. If you have a 30 amp fuse, you'd better have #10 gauge wire.
If you have a trailer with electric brakes, the only safe way to run the negative wire is a #10 wire from the 7-pin connector all the way back to the battery negative terminal. Grounding the negative wire to the truck's chassis isn't as safe, and with brakes, you really don't want anything to go wrong.
Ken
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