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After playing with it, it seems like it works with the harness even if the load resistors aren't connected, but doesn't work without the sub harness. Weird.
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Here's a jpeg that one of our member posted. He included wiring his OEM lights along with the Motodynamics tail light.
Notice there are 3 ground wires (Black) coming from the Motodynamic light.
Tie these three back wires together and connect them to the black wire from the original tail/brake light. The original tail light ground (black)wire has more than enough current carrying ability for the entire Motodynamice light assembly.
I think your problem may be with the ground path...