If you need to find a blown fuse in a car's fuse box, there is nothing wrong with pulling each fuse, testing it with a continuity tester, and, if good, re-installing it. Nothing wrong, except that it is time consuming and avoidable.
This in-circuit fuse tester will find the bad fuse without pulling it except for one failure mode. This situation is covered by pulling the fuse.
If you are interested, please see
https://rick.sparber.org/InCircuitFuseTester.pdf
Your comments are welcome. All of us are smarter than any one of us.
Thanks,
Rick
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