The library usually has some good resources for info. Here I have been able to find all kinds of wiring diagrams. You need to ask not just look for yourself. I have found some of it is not check outable and is then behind the counter. They will usually make a copy for you. I am an electrician by trade and I have found the best way to trouble shoot a ground in a car electrical system is to get a 12 volt light bulb, solder wires to it and put it in place of the fuse. If you have a ground it will light up brightly. When you clear the ground it will either go dim or out. Keeps from blowing fuses. That can get real expansive.
Gary