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Littelfuse Automotive Fuse Tester

Fuses came up during the Second Squidwrench Electronics Workshop, so I’ll bring a handful along to the next session. Conveniently, the doomed Sienna’s rear storage compartment disgorged a new-old-stock box of fuses, along with a fuse puller/tester containing a pair of feeble¬†vintage 164 / LR60 / AG1 alkaline cells:

Littelfuse Mini Auto Fuse Puller-tester - as opened

Littelfuse Mini Auto Fuse Puller-tester – as opened

Somewhat to my surprise, the other side of the PCB has components:

Littelfuse Mini Auto Fuse Puller-tester - circuitry

Littelfuse Mini Auto Fuse Puller-tester – circuitry

It looks like transistor switch to minimize the current through the fuse and protect the LED from over / reverse voltage, should you apply it to a live circuit.

A pair of new cells had it working just fine, not that I expect to need it in real life.

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