For most things I just kinds know what circuit the blown fuse has to be on based on what doesn't work.Gimmick, pass.
Meh, the fuse block in my c10 is even easier. Still uses glass tube fuses. Look underneath and instantly see everything that is blown at a fraction of the cost.These may be gimmicky.... but would prove very helpful, especially if the fuse panel is lit up like christmas tree because you've got major electrical issues.
Given electricity takes the path of least resistance, probably a resistor infront of the LED since they don't need much voltage to work. Fuse element intact the current goes that way. When it pops now it's on the LED side.No doubt its a SMD(surface mounted device) L.E.D inside the fuse... those things are tiny.
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