A tale of positives and negatives: which is which?

OK, I got the Xantech, 1/8 triggers from Radio Shack, the diodes, and the power supply. Right now, I did the following:

  1. Cut the triggers in half and followed the diagram to strip them and connect to the Xantech
  2. Cut the power supply and connected to the screws on the Xantech
The problem I’m having is that I don’t know which is + and which is on the Radio Shack triggers.
The way the Radio Shack triggers are constructed is there is a copper run in the middle surrounded by plastic insulation and then that is enclosed by what I assume is the ground, which is arranged in a mesh-type weave around the plastic insulation. The plastic insulation is a bit of a pain as I can’t really bend this with ease.

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