I have been having trouble keeping my battery charged. I beleive that the engine compartment light switch is the possible cause. The switch is located on the driver side and is made of plastic. Pressing on this switch doesnot turn off the light. There is a single wire attached to it (brown or red). How does this switch brake the circuit to shut the light? Does it ground itself to the chasis? Does anybody have or know of a good wiring diagram to follow on the web.