I am tired of just changing parts to fix issues with my car. I want to learn to diagnose issues with the wiring harness and sensors on my car. Is there any kind of home study course that hits on the basics. I learn pretty quick but I would rather not experiment on my car. Any suggestions.

What books are useful.

What about test circuit boards, heres one I found maybe something cheaper?
http://www.veejer.com/start_kit.html

I waste a lot of time chasing wires instead of learning the schematics, learning terminology. Can anyone provide any suggestions on this please.

 

Buy a service manual, learn to read an electrical diagram, learn to read and use a multimeter, understand the very basic principles of a circuit, and use common sense

Try something small like wiring in power seats or building a manual fan relay with a toggle switch

I try to tell people that wiring is just connect the dots. Repeatedly. Once you grasp the basics, the rest is the same, just arranged differently

 

http://www.austinthirdgen.org/index.php?pid=19

That's wiring diags for just about every 3rd gen.

https://www.thirdgen.org/service-eng...ht-error-codes

That's how to pull the codes from your ECM if you dont already know.

There's very little that you can't accomplish with a simple $3 digital volt/ohm meter from Harbor Freight.