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You ask "how do people learn this". IMO we don't normally act pro-actively as you are seeking to do. We tend to "learn" by fixing our own problems when they arise or as part of implementing a "project" like building a whole car or making an upgrade to an existing one. Much depends on your background knowledge of electricity in general, did you study Physics in school, do you understand the basics of simple circuits, OHMs law, relays, electromagnets etc.... if not then why not pay around £50 for a kids educational kit on "Electricity and Magnetism". Have fun as you put together basic circuits, understand how electricity behaves. Then get your hands on the circuit diagrams for the various parts of a cars electrical systems, youll find these on line, in loads of places, concentrate on a bit at a time, for example, how is the ignition spark generated ?, how does a light flash, why does a fuse melt ?. Then, when, in the real world, you face a real problem, like the rather general question "The guages don't work" you will instinctively know how to go about looking in more detail at the various wires and sensors that might be involved. This is just my advice for what it is worth.

I just booked 3 tickets... I know, I know, I should have done it earlier