Need help with wires leading from starter relay
 

I have a short in my electrical system. I have checked my circuit and find the only way to eliminate the battery draw is to take the yellow, green and blue wires off the starter relay. The yellow is headlights and dash board. What are the green and blue? How do I find the short in the headlights. Actually, with the yellow off the relay the test light goes out but you can still see spark on the battery ground post with the test light even though it is not enought to light the bulb. I have taken all the fuses out and the test light still lights. Only by removing these three wires does the problem go away.