Capt Jon
Well-Known Member
- First Name
- Jonathan
- Joined
- Nov 5, 2019
- Threads
- 1
- Messages
- 71
- Reaction score
- 123
- Location
- St Augustine, FL
- Vehicle(s)
- 2019 Ford Ranger
While the fuse cannot measure current, it should blow when the current through it exceeds its rating. The problem is the wiring after the fuse may not be rated for the same current the fuse on the circuit is. Take for example a 20A fuse to 5 4A loads, the wiring to a single load on the circuit may only be rated for 5A (still 25% over the device's intended load) for its given gauge and length. But should that part malfunction in a way that it's drawing 15A, it will burn up the wire and still not blow the fuse.
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