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For anyone who is really wanting to study some good "auto electrical Information," here is a website to check out.
The site: https://www.aa1car.com/library/tselec.htm
I have been looking at this subject for about 3 years. And I have found this AA1 site to be the best one I have seen. Check it out. It will really help you learn the subject.
For anyone interested in adding aftermarket equipment, or just general troubleshooting, bookmark the12volt.com. It is a great site, especially for anything involving relays. If you want to add lights, alarms, or just about anything, you'll find this site useful.