front blinker relay help

im not familiar w/ relays, so please bare with me. i need a relay that has a basic input and output that should flow normally, but when another power source is added through another input, the output of the original stops it feed. is there a particular relay like that? or can somewhen just tell me some way to make one? hope that was clear enough, thank you.

vinh766

email me at djfearny2@aol.com and i will tell you what to do ... what i am guessing it that you want side markers or something to stay on when parking lights are on and when that sides turn signal is on you want them to blink i can tell you how to do this just email me and tell me if this is right.

jon