I've installed an aluminum radiator with electric fan to replace my stock rad and engine fan. Where is a good place to tap into 12v hot with engine running? This is the feed that will energize the relay. Not the one that powers the fan. I got all that part done correctly. I though I had it all done. However, silly me had tapped into a wire at the diagnostic port. That wire was hot with key in on position but goes dead when engine starts. I need one that stays hot with engine running only. Thanks for your help.