Swapped to a multimeter with a capacitance setting - game changer for diagnosing bad start capacitors

For years I was doing the old trick of checking capacitors with a visual look and hoping the bulge was obvious. Three weeks ago I finally grabbed a Klein multimeter that has capacitance readout for about 70 bucks. Last Tuesday I was on a job in a basement in St. Louis, dryer was humming but not starting. Popped the capacitor, meter showed 8 microfarads instead of the rated 12. Saved me 45 minutes of guesswork. Anyone else made the switch to a proper meter and notice how much faster you can rule out cap issues?

3 comments

3 Comments

the_aaron4d ago

That 8 microfarad reading instead of 12 is exactly the kind of thing that hides in plain sight. When you got that reading, did it make you question if maybe your meter was off at first, or did you trust it right away and go straight to swapping the cap? I only ask because I've run into guys who still swear by the analog needle meters and say digital stuff lies to them sometimes.

the_tessa4d ago

the_aaron I feel like it depends on the job. For a dryer hum that's obvious, sure, the meter saves time. But for some random fridge that's acting weird, I'm not convinced swapping a cap that reads a little low is always the magic fix. Plenty of times I've changed one and the real problem was something else entirely.

jordanblack4d ago

That 8 vs 12 microfarad thing reminds me of how people treat weird noises in their cars. Like you hear a rattle and you throw new brake pads at it, but it was actually a loose heat shield the whole time. I mean, meters and test gear are great for pinpointing stuff, but they're only as good as your hunch about what to check first. Maybe it's just me, but I feel like half the battle is knowing which symptom to chase and which ones are just distractions.