An In-circuit Car Fuse Tester

[Baddog]

Worked for me too (Chrome).

Seems like the same thing I do with a common test light and only one hand.

Clip to ground, touch pointy probe to fuse terminal. Hot side lights tells me the circuit is live, load side lights tells me fuse is good. If I don't know which is which and neither lights, circuit isn't active (or bad ahead of fuse, etc). If only one side lights, the one that didn't is the load side, and the fuse is bad.