End Cut

How can I tell which wires on my 12V DC adapter are positive and negative if I've cut off the plug end?

I have a 12V DC adapter, and I needed to use it in an electronics project. I cut the round plug end off of it so I could use a breadboard for my project before I go and get a PCB fabricated. How can I determine which wire is positive and which is negative. I don't wanna blow up any Capacitors!

Got a meter?
Test lamp and rectifier?

RESIDENT EVIL - VOICE ACTING HORROR - 10 MINUTE CUT




Sericho pallasite meteorite 407 gram polished end cut
Sericho pallasite meteorite 407 gram polished end cut

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Sericho pallasite meteorite 402 gram polished end cut
Sericho pallasite meteorite 402 gram polished end cut

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Sericho pallasite meteorite 573 gram polished end cut
Sericho pallasite meteorite 573 gram polished end cut

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Sericho pallasite meteorite 263 gram polished end cut
Sericho pallasite meteorite 263 gram polished end cut

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METEORITE SLICE or END CUT TOP QUALITY SFT 0621 2232g GREAT SPECIMEN
METEORITE SLICE or END CUT TOP QUALITY SFT 0621 2232g GREAT SPECIMEN

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Millbillillie 26 gram  end cut  Eucrite
Millbillillie 26 gram end cut Eucrite

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Unclassified Nwa Meteorite 233g Beautiful End Cut Possible L LL
Unclassified Nwa Meteorite 233g Beautiful End Cut Possible L LL

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NWA 791 10 gram end cut
NWA 791 10 gram end cut

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Chelyabinsk nicely crusted end cut LL5 44 g
Chelyabinsk nicely crusted end cut LL5 44 g

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Newly Cut GHUBARA meteorite end cut L5 72 g Very Nice
Newly Cut GHUBARA meteorite end cut L5 72 g Very Nice

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METEORITE SLICE or END CUT TOP QUALITY B9 3446 4125g GREAT SPECIMEN

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METEORITE SLICE or END CUT TOP QUALITY SFT 0595 326g SEE PHOTOS
METEORITE SLICE or END CUT TOP QUALITY SFT 0595 326g SEE PHOTOS

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