Lights on Pre-lit Tree Not Working?

I have one of the pre-lit trees with the white fuse bulbs. After destroying the white base and replacing it with a regular bulb in a green base it didn't work. I cut out that socket and wired the two strands together. The strand does not work. Anyone that can tell me why? There was a third cord, but it does not have wire only a fiber like filling.

By Gayle G