What you'll learn
**Reported symptom:** K1 pulls in, but YV1 chatters and measures low voltage only while energised.
Lab time: ~12 minutes.
Lesson briefing
High-Resistance Solenoid Terminal
Reported symptom: K1 pulls in, but YV1 chatters and measures low voltage only while energised.
The circuit was commissioned from a known-good drawing. Treat every terminal as suspect, but test from source to load instead of guessing. Use voltage mode on an energised control circuit and continuity only after the simulated circuit is isolated.
Your task
Use a voltage-drop test across the load-side connection while the solenoid is commanded on.
Choose the fault category only when the measurements support it.
Hints
A resistance check with no load can miss a loose terminal; test voltage drop under load.
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This lesson uses 8 placed components on the lab canvas. Components are vendor-neutral (no proprietary trademarks); the wiring rules apply to any equivalent industrial part.
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