I have a 40 year old alternator i am rebuilding. It has a capacitor on the back that says 2.2uf. I tried measuring it with my harbor freight dvom and it just reads 0.000. I tried a different dvom and it reads 210nf which would be .21uf. I want to be sure im checking it properly.
I need some help checking capacitance of alternator suppression capacitor
- Thread starter joegreen
- Start date
You are checking it correctly and is showing .21 uf. Its auto ranging so there's no getting it wrong once capacitance is selected.The other meter which shows all zeros is likely set incorrectly. After 40 years the capacitor likely has dried up and is bad. It's purpose is for noise suppression for the AM radio. You can obtain a free standing supressor on ebay to replace the one you have.
Does this alternator use a seperate mechanical regulator? If so that capacitor is important.
Caps go bad, especially electrolytic.
I build guitar tube amps as a hobby (used to anyway.) Re-Capping a vintage Amp is common place. It's sad ot have to do that to a 57 Fender Deluxe, but the caps do go bad after years and years of use.
I build guitar tube amps as a hobby (used to anyway.) Re-Capping a vintage Amp is common place. It's sad ot have to do that to a 57 Fender Deluxe, but the caps do go bad after years and years of use.
Just like starting caps go bad in A/C compressors.
But gone are the days when Allied Radio & Electronics sold about every transistor & resistor and capacitor you could think of.
But gone are the days when Allied Radio & Electronics sold about every transistor & resistor and capacitor you could think of.
It has the regulator bolted to the back of the alternator with the brushes attached. It’s an al80x alternator
You could try testing a known good capacitor with that "Tacklife" meter. See how it reads it.
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