Walk behind SW36A-15KH DC output voltage

I have an SW36A-15KH pull start walk behind serial number 8050437 with the kohler command pro 15 CV15T spec # 41581. Can anyone tell me what the DC output voltage to the clutch should be? This mower had a bad pto clutch in it when i bought it last week. I replaced the clutch and noticed that the DC voltage going to the clutch was rather high. At full throttle it can get up as high as 25v. Kinda high for a 12v clutch. I tried 3 different rectifier regulators , all giving the same readings.Am i having incredibly bad luck with a rash of bad regulators? Someone on youtube suggested the "capacitor" was maybe bad. His mower has the kawasaki motor on it so i dont know if the something specific to kawasaki or not. All i know is mine didnt come with one and it doesnt show one in the wiring diagram. Here are the three rectifiers that i tried. The original one that came on it 12 403 01 , superseding the original
12 755 111-S , sten 435-563. Al supposedly the same thing.The The first two i had tested with the kohler rectifier regulator tester and both show "high" on the results. Ill be taking the third to be tested today.Any info will help. Thanks.

Walk behind SW36A-15KH DC output voltage