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Stopped guessing pinouts and started ringing out every wire with a meter, night and day difference
For my first three years on the bench I was that guy who trusted the maintenance manual pinout chart like it was gospel. I'd pull a connector, count the holes, match it to the diagram, and button it back up. Then about six weeks ago I had a Gulfstream G550 in the hangar with an intermittent autopilot disconnect and the book said pin 14 was ground. I wasted almost a full shift chasing a wire that wasn't even in the circuit, because the manual was two revisions behind the actual harness on that tail number. My lead, a guy named Ray who's been at this for 22 years, walked over and said just ring it out, the plane doesn't care what the paper says. So now I grab my Fluke 1587 and tone every single wire before I touch anything, even on jobs I've done a hundred times. Takes me maybe ten extra minutes and it has already saved me from two callbacks in the past month. The old charts are a starting point, not the truth, and I wish somebody had drilled that into me on day one. Anybody else get burned trusting a manual that hadn't been updated after a mod?
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