Could a sh775 kill a stator?

[posplayr]

My brother has been a service writer for a polaris dealership for several years. They replace the exact reg/reg you guys recommend on this site all the time because they regularly fail and ruin stators. it's not any better than any other, and arguably worse. For the past year they have been recommending mosfet regrecs (aftermarket, which is not their norm because they are a dealership) and have concluded that they are superior.

That is certainly an interesting comment. I know there are some bikes where there are recommendations for MOSFET R/R's when the stators DO NOT burn up. But if there is any evidence of burning stators then a SERIES R/R is the solution which can be one of a few on short list. The SH-775 is the cheapest.

I don' know if there is even one case where someone has had a stator failure using a SERIES R/R except if the stator had already been run using a shunt R/R or the stator had suffered a mechanical failure after many miles.

Maybe someone has their part numbers wrong?

My brother has been a service writer for a polaris dealership for several years. They replace the exact reg/reg you guys recommend on this site all the time because they regularly fail and ruin stators. it's not any better than any other, and arguably worse. For the past year they have been recommending mosfet regrecs (aftermarket, which is not their norm because they are a dealership) and have concluded that they are superior.

[posplayr]

exact same test as "leg to leg" just put one lead to case ground; You should see zero VAC whereas leg to leg is 80VAC.

You are checking for any evidence of a short in the winding that might occur at many places.

Thanks. I will look at the revised tests some more tomorrow. I looked real quick and my head was starting to hurt. I sure its not that hard to figure the test out. It just was a lot to take in tonight.

[posplayr]

The stator is probably going out. You did not mention doing the leg to leg tests at 5K RPM. These are usually the best tests.
You might get a better indication .

And here are some updates with background to the Phase B tests that focus on the stator alone.

A revised test is at this link; The actual test is on Page 6 of 9. We added the leg to ground AC voltage test as this helps isolate insulation breakdowns to ground using the relatively high 60-80 VAC stator voltage when it is open loop.

Link to Revised PHASE B of Stator Pages with discussion of testing methods:
http://www.keepandshare.com/doc/3977...4-pm-649k?da=y

So I went and checked the charging system again after the bike sat for a few hours. upon first starting the engine I was getting 14.1 at 4000 rpm. The bike idled there for 2 minutes tops. I checked it again at 4000 rpm and was under 13 volts again. Not sure what to think now. I am going to check again this weekend when it stone cold.

The rr has the right numbers stamped on the end so I think it is oem.
I probably ran it 15 minutes. I am going to pull the stator cover off and see if the stator looks burnt up. I did notice the rr was warm to the touch. it wasn't hot though. I believe my wire were hooked up right.

[posplayr]

First question: Is it a real Sh775?
Second question: how long did you run the stator with a shunt R/r?

Regardless of the answer it is extremely remote that the sh775 caused any problem. Like you just won the lottery .

[harman84]

I got a used sh775 and installed it today and upon startup at idle I was getting over 13 volts. 14.1 at 4000 rpm's. I figured I had fixed the charging issue. I checked it again tonight and it was not charging. I checked the ac output on stator wires and 2 were around 50-55 volts and one had nothing. Could the rr killed my stator?

Before I installed the new rr I was getting over 80 volts on the stator. I hooked 3 yellow wires to the grey plug and red on inside black and ground on outside of the black plug. Any ideas? I don't want to get a new stator and have same result.