Feature:1. According to original OEM specifications, part numbers for reference: 4140309 4140305 210667017.2. Fit for Kohler and fit for John Deere, universal for 825 HP engines with 15 Amp alternators.3. A great replacement rectifier for early style box regulators. Has 3 terminals in a row.4. Function as converting alternating current (AC) to direct current (DC).5. Through the principle of rectification, the phenomenon of idling jitter can be reduced and the power can be improved.Specification:Item Type: Rectifier.Material: Aluminium Alloy + ABSOEM: 4140309 4140305 21066-7017Fitment: Fits for many 8-25 HP Engines with 15 Amp AlternatorsFit for Kohler Fit for John DeereWiring:1. Power Coil to power positive2. Battery (+) to power positive3. Power Coil to power positive4. GND to power negativePackage List:1 x RectifierNote:Please double check the part number of your item, matching information is for reference only. If you are unsure of the item, please contact us before buying to avoid unnecessary return, thanks!