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Positive ground truck plugging into modern trailer

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The question I have is my 72 R is wired positive ground so  can it be plugged into a modern trailer ? If the trailer has regular sealed beam lights it should work because  incadesant lights  can reverse polarity . However led lights only work wired negative ground  I have tried  tried . Is anyone fimiliar with this ? 

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  • 3 weeks later...

I just bought a led license plate light. No instructions on wiring two black wires. I checked the light before installation.  Worked no matter how wired up . I would  have thought one would be + the other - .


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