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- YMD-003 VARISTOR BLACK
YMD-003 VARISTOR BLACK
YMD-003 is a varistor black for the rotating rectifier in brushless generator alternators.
About this part
One failed diode is enough to make an alternator run hot, lose voltage or overwork the AVR, so the rotating rectifier is checked whenever voltage problems appear.
When to replace it
- Low output voltage with the AVR at full excitation
- AVR failing repeatedly
- A shorted or open diode found on testing
- Burnt varistor after a surge
Before you order
Test every diode in the bridge, not only the obviously damaged one, and replace the varistor at the same time.
If the old part has no readable number, send us a clear photo with the engine or alternator nameplate and we will identify it before you buy.
Questions
How do I test a rotating diode?
Disconnect it and check it with a multimeter on diode test: it should conduct in one direction only. Replace any that read short or open both ways.
Specifications
| Part number | YMD-003 |
|---|---|
| Brand | IEP Power Products |
| Range | Rectifiers, Diodes & Varistors |
Not sure it fits?
Send us the number on your old part, or a photo with the engine or alternator nameplate, and we'll confirm the match.
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