The Fallout 76 Type-T Fuse is an item you must find as part of the main storyline, and despite the waypoints pointing to the general direction, is a little harder to locate than first appears.
There's also the Gregs Mine Supply Keys in the same area, allowing you to open up some doors. Though not essential, if you're the sort who gets bugged by loose ends, then you'll want to know where they are found.
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Where to find the Fallout 76 Type-T Fuse location in An Ounce of Prevention
Finding the Type-T Fuse location is part of the An Ounce of Prevention quest in the main storyline. It'll appear in your main objective log at a location south of Morgantown and south-east of Vault 76, as follows (alongside a series of blood samples which are all also specified on the map further south - look for the small circles!):
When you approach the waypoint, you'll find a building. Approach this from the west side to find some stairs going down into a basement:
Head into the basement, where the waypoint will be hovering at the entrance to an underground passage. Annoyingly, it seems to stop at this entrance, and not guide you directly to the Type-T Fuse location:
It does, however, point you in the general direction you need to go. Proceed down this passage until you reach another room.
Head to the far corner, then go up the stairs to reach the ground floor of the building.
Now as soon as you emerge up the stairs, face right, and you'll see a red crate right in front of you.
Investigate this to find the Type-T Fuse location.
Type-T Fuse found! Now reverse the way you came, or fast travel to the other objective markers, to continue the story and the upcoming Fire Breathers exam answers. Unless, of course, you want to find out where the Gregs Mine Supply Mine Keys are first...
Need more help? If you are following the main storyline, then you'll come across the Type-T Fuse location and Fire Breathers exam answers quests. If you're after online activities, there is Fallout 76 Workshops and base building and how to unlock PvP. If you're after higher-level goals, then we recommend observing the level zones map, unlocking Atom Challenges, plus how to join the Enclave and launching nukes with launch codes.
Where to find the Fallout 76 Gregs Mine Supply Keys location in An Ounce of Prevention
If you continue exploring the ground floor of the building, you find several locked doors. These require the Gregs Mine Supply Keys.
To find the Gregs Mine Supply Keys location, from where you found the Type-T Fuse, head into the next room to find an area filled with shelves. Head to the doorway in the south corner.
These leads to a locked door requiring the Gregs Mine Supply Keys, and some stairs. Head up them.
Head through this room into another room, with a terminal and a bright blue object on a desk.
This is the Gregs Mine Supply Keys location.
Pick it up, and you can open the doors downstairs which - spoilers - simply take you outside.
Well, that's that mystery solved. But if you were like us, you wouldn't have left without finding out where they were or where they went to - so now you can continue on to the Fire Breathers exam answers without that eating away at you!