Showerthought: my old foreman told me I was chasing the wrong end of the diagnostic, and it stuck with me
I was 23 and had been pulling my hair out on a no start for two days, replacing sensors and checking grounds, when he walked over and said 'quit guessing at the spark side, go check fuel pressure first.' I started keeping a cheap fuel pressure gauge in my top drawer and now that's the first thing I grab on any crank no start, still feels weird that one sentence rearranged my whole order of operations. What's the one piece of pushback that actually reordered how you diagnose stuff?