Unless you are familiar with the engine compartment, you probably will not find it. You may be able to find it by tracing the wires to the headlight bulb backwards to the headlight relay. It's also possible the dimming switch on the steering post is not working right. Try to google for your model and "headlight relay" photo. I find that the auto parts people are usually very helpful especially if you buy their parts. Otherwise, you may be able to find a repair manual at library for your make year and model.
Answers & Comments
Unless you are familiar with the engine compartment, you probably will not find it. You may be able to find it by tracing the wires to the headlight bulb backwards to the headlight relay. It's also possible the dimming switch on the steering post is not working right. Try to google for your model and "headlight relay" photo. I find that the auto parts people are usually very helpful especially if you buy their parts. Otherwise, you may be able to find a repair manual at library for your make year and model.