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Spent 8 hours chasing a phantom voltage drop on a G1000 system
Had a King Air in the shop with a PFD that kept blanking out. Traced it to a 0.3V drop on a 28V power feed, but the wiring looked perfect. Turns out, a tiny bit of green corrosion inside a cannon plug pin was the culprit, and my meter probes weren't making good contact at first. Who else has lost a full day to something that simple?
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walker.jana1mo ago
Was it even a real problem?
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ericp671mo ago
Man, that hits home. I spent an entire afternoon on a nav light that wouldn't light. Checked the bulb, the switch, the circuit breaker, everything. My meter showed voltage right at the socket. Finally, on a hunch, I cleaned the ground connection on the wing spar, which looked totally fine, and bam, light came on. Just a thin layer of oxidation breaking the circuit. It's always the simple ground or connection you swear is good.
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