Have a 2005 XL basic truck, w/ Parking & Fog lights but w/o auto headlights. I Bought a Switch with auto headlight feature and the correct plug configuration. The switch has an open pin #7 for which my harness has no wire feeding it. All the switch settings work expect for the Auto setting. Does anyone know where that wire comes from or where it attaches? Is this a feature of the light sensor wiring to and from ? If so, what does the wiring feed to the sensor come from? Also, there is no light sensor or wiring installed in this truck. If I put a sensor on the dash attached one lead to a hot wire and the other to the headlight switch, pin #7, would this work? I have a manual A/C switch and believe from what I have read that no dealer cluster program is needed. Is this correct? Any experienced help will be much appreciated. Thanks,

 

you will definitely need the light sensor on the dash. this is the only way for the truck to know when to turn on the lights.

I'm sure that someone on here has access to the wiring diagrams and will help you out.

 

Would it really need a light sensor? Isn't the sensor merely a switch that allows and turns off the energy flow to the Headlight switch. I would think that without the sensor the lights would merely come on and stay on with the ignition until it is turned off. Is this faulty logic? Any experienced help would be appreciated. Thanks!