Schwinn Vestige no longer lights up; why not? I have the Schwinn Vestige and a very long, bumpy, dirt/gravel driveway.

A few weeks ago, we rode downtown and the frame lit up amazing, as it should.
On the way home, it was not lit up. Hmm.

After a tiny amount of investigation, I found the cap and cover was missing (I mostly blame the driveway).
I ordered a new one (a mere 7 dollars) and installed it.  But alas, the frame still would not light up.  

I clipped and stripped the wire from the LED's to the cap/cover thinking they may have been gunk-ified and re-installed the cap/cover.
Nothing. 
I switched the red and black wire within the cap/cover.
Still nothing.

I tested the electrical output from the Shimano DH-3N30 Dynamo hub and all is good.
Still no lights. I pulled the generator/wires out from the frame to inspect for damage and, as expected, there was none.

I am at a total loss.

The local bike shop admitted I knew more about electricity then they did. 
I cannot find any advice or schematic regarding how the lights light up nor can I figure out how to test the lights beyond the hub.

(Note that I have not probed the wires in the frame while spinning the wheel to check for connectivity.)
Daniel, I ended up going to the local Schwinn dealer and doing a warranty exchange on the lights. Schwinn supplied the whole new setup (as they had initially made it a non-repairable unit) and I installed it. I had to pull apart the entire headset and clip all the zip ties on the front fork. The whole process was time consuming, but not challenging. If the shop had done it, it would have cost me. The hardest part was treading the new cable through the hole in the frame and cutting it to the correct length