Wiring Question

[06nad]

I am installing the Value Accessories spotlights on my 06Nad. Which wire do I tap into in the headlight bucket for the "on/off" switch? I want the spotlights on when the headlight comes on, but also be able to control them with a switch. I read somewhere to tap into the blue/white wire behind the connector, but I don't see a blue/white wire. I have everything else wired except the on/off switch...HELP

Thanks.