Took me 9 hours to find a bad ground on the boom limit switch last Tuesday

Had a 60 ton Grove dead in the yard at the Port of Tacoma because the boom would not come down. I chased the wiring for 9 hours straight, checked every fuse and relay twice, before I found a corroded ground lug behind the panel that looked fine from the front. The whole fix took 4 minutes once I saw it. What is the dumbest gremlin that ate your whole shift?

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