Below are a few things to look at. Something to remember, you won't be doing electronic design in an automotive environment so don't get too hung up internal circuit details just yet.

You do need to know in general what electronic components are and how they operate. You don't need to memorize formulas, resistor color codes or " the right hand rule ". Lazy or unskilled teachers rely on students memorizing formulas because it is easier to test for than " Does this person grasp the concepts set forth. " Real life is open book and a person that understands concepts will be more productive than one that has the ability to memorize something just long enough to stumble through a test.

The key to reading a schematic / wiring diagram is knowing how the individual parts behave.



Forrest Mims

Look for his books

Getting Started in Electronics

Engineer's Mini-Notebook


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Apollo AGC Part 1: Restoring the computer that put man on the Moon

So far there are 5 parts to this, I don't expect another part for a while since each person is now independently working on a piece of the project.

https://www.youtube.com/watch?v=2KSahAoOLdU

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Techmoan

He explores vintage tech. Older stuff is understandable so it is worth a look

https://www.youtube.com/user/Techmoan/videos?disable_polymer=1


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bigclive

Does teardowns and reverse engineering on simple items.

https://www.youtube.com/user/bigclivedotcom/videos?disable_polymer=1


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Vintage disco buckle light. (with schematic)

https://www.youtube.com/watch?v=8tf7x02AyRA


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Cheap eBay dimmer module vs compliant dimmer. (Schematics)

https://www.youtube.com/watch?v=w71Qr1ygB_Y

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Autopsy on exploded remote control socket.

https://www.youtube.com/watch?v=mVkEDduVQJA


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Faulty British General circuit breaker autopsy.

https://www.youtube.com/watch?v=WcxISVcIpCA


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Good versus evil socket testers. (with schematics)

https://www.youtube.com/watch?v=3_3FCAbNyMM


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Inside a cheap eBay LED power supply. (With arcing flaw.)

https://www.youtube.com/watch?v=Rcuk8wPinkM


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Inside a night angel illuminated socket cover. (schematic)

https://www.youtube.com/watch?v=225LhPh5uxk


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Inside a REAL Snap Power UL certified night light.

https://www.youtube.com/watch?v=JqBZQ23TaZg