you buy a crimp on style plug and put it on the wires. The reason the panels come without the plug attached to the wires is so you don't need to drill as big of a hole on the cage to run the wires out of. You panel should have actually come with one.
They are also called "easy wire plugs" http://www.google.com/imgres?sa=X&bi...d=0CKsBEK0DMBs
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