I hope you didn't go about those in the same way. Stabbing in the dark.
No we relied on testing equipment but our maintenance manuals are more thorough than the average automotive repair manual. We had accurate troubleshooting trees that starts with the easiest test, to the hardest. We are also required to know how to read schematics, perform voltage checks, and know theory of operation for each system. This is why troubleshooting an F-16 seems to be easier than troubleshooting a Goldwing.
There was my last assigned F-16 I used to work on. Aircraft 1355...received top-flier awards about 6 times when I was a younger Airman. I miss working them (I'm retired). The F-16 has always been one of the most badass jets ever, even against the old F-15 Strike Eagles. She was a great jet!