LMC LED tail lights help

[slimjim66]

Hey guys, I bought these tail light for my build a while back, I’m finally getting around to installing them and before I did I thought I would test them to see how bright they were and I can’t get either of them to work. I’ve taken them apart, checked the harness, used new gator clip test wires and nothing.

Am I missing something here, black to ground and white to positive should make them fire no? I’ve tried reversing the wires and still nothing.