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Test light!
stupid simple tool that has served me so long.
While those from Snap-On cost a king's ransom, I have one that's been around for almost thirty years. Now, of course, they have all manner of uber-cool test lights to indicate polarity, voltage level, presence/absence of current, etc.
If you're too cheap to buy one, they are easy enough to make.
Another tool I use often is a cigarette lighter plug with stripped wire ends. Provides a known good source of both +12VDC and -12 VDC and the ability to have a known good ground while using the test light is pretty indispensible.
PT
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Watch out, I have a soldering iron and a ham radio license (it's worse, it's an extra class license too!) and am not afraid to use them!
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