Jack 90

Alright just bought meself a dt125 r and wanted to tidy it up abit by put a tail tidy on for my reg plate. There is 2 wires blue and black with white stripe and then it was join to 4 wires for the reg light. I have snipped it at the 2 wire and connected new light and tried starting it and no electricity at al so connected old back on and still nothing not even a noice wen I turn the key. I had it running before I done this. The bike doesnt have a kickstart either. Anyone had this problem head is baffled thanks jack