Question about rectifier

[artr]

I have read about getting AC voltage from a rectifier interfering with normal operation and possibly causing not reaching top RPM and speed. My 96 GTX runs normally and will rev to 7000 RPM out of the hole but will reduce to about 6800 running flat out. I know about other things to check (RAVEs, water box regulator, exhaust hose) but decided to check the rectifier for AC voltage when revving. I got 14.3Vdc and switched the meter to AC and read about 29Vac. My boat is near by and did the same test and got a similar result. The AC voltage was present even at idle. The meter is a Centech (Harbor Freight low cost multimeter) but seams to give me accurate readings whenever I use it for AC, DC or ohms. My question is should you be reading 0Vac on a seadoo rectifier? If not 0, then how much AC voltage is too much?

 

[Stevie96xp]

Himmmm well I’ve never checked how much ac voltage is present. But if you can just disconnect the red wire coming out of it and run it down the lake and see if it changes

 

[burtshaver2021]

Just following along here, interested to see how this turns out. My electrical knowledge is very low,, If I would have had to guess, I would have thought there would be 0 AC volts coming out of the regulator., So having the multimeter on ACV setting when your expecting DCV won’t hurt the meter then?

 

[artr]

Should not affect the meter. Normally the meter would filter out DC when measuring AC and vice-versa.

 

[Grim]

I would not rely on a cheap meter for that measurement.....they can tend to get confused when reading A/C on a D/C line line especially when a rectifier is involved.

 

[mikidymac]

6,800 at full speed on flat water is normal. I would run it as is and enjoy.

 

[artr]

6,800 at full speed on flat water is normal. I would run it as is and enjoy.

Thanks. No need for me to investigate further