Stator test with low voltage output - SV650.org

JaxintheUK · 25-09-19, 08:33 PM

My battery has died due overcharging, so I've been doing test's to see what's wrong. I would say that my r/r is probably toast...it was a decent mosfet based one and only a year old, so there must be something else wrong with the system. Taking the r/r out of the equation I tested the ohms and all three wires were showing 0.5ohms. Next tested the continuity with ground on all 3 wires...no continuity, so that's fine. Tested the stator output and at 5000 revs it's showing 49 volts on each wire. The readings should be a minimum of 60v each. Does anyone know what would cause such a low output?

johnnyrod · 25-09-19, 09:18 PM

Are you doing it with the RR disconnected? I would have said 75V minimum but yeah 49 is low. Are you sure of the accuracy of your multimeter? Using it on AC mode not DC? Connecting it to a pair of wires from the stator, not to anything else? Sure you don't have any continuity to earth? If in doubt, double check all this stuff.

JaxintheUK · 25-09-19, 09:55 PM

Yes, the r/r is disconnected. I used two different multimeters, so I know it works OK. Yes, it was on AC not dc. Definitely no continuity to earth. I've been reading a brilliant thread on here for testing everything, so I'll be checking everything again tomorrow.

Seeker · 26-09-19, 07:19 AM

Broken/weak magnet on rotor?

JaxintheUK · 26-09-19, 09:54 AM

That's what I'm thinking. It's always something...I've spent so much time fixing the bike that the summer has passed me by.

Seeker · 26-09-19, 10:09 AM

I'd check the magnets for tightness and then I'd fit a new R/R (since your old one was overcharging) and see what your battery voltage is at idle and at 2k rpm.

JaxintheUK · 28-09-19, 12:13 PM

I re-did the stator check, as I was doing it wrong...I was doing it to ground. At idle I have 30vac and 5000 revs its 100vac on all three pairs. Is this OK? I have a new r/r from a gixxer, is the voltage too high, or is it fine...I don't want to blow this one.

GeorgeRYoung · 28-09-19, 01:04 PM

The manual just says more than 60V at 5000. My opinion is it should be fine.

JaxintheUK · 28-09-19, 07:50 PM

It seems to work well, a nice 14.5v on the battery. It's made my day

Then it started raining. lol

glang · 29-09-19, 08:57 AM

good news but still hasnt answered why the original RR failed. You didnt jump/bump start the bike with a flat battery at some stage did you? In fact how do you know the battery died of overcharging? Also was the RR cooled as best as possible?

25-09-19, 08:33 PM	#1
JaxintheUK Junior Member Join Date: Jul 2019 Posts: 23	Stator test with low voltage output My battery has died due overcharging, so I've been doing test's to see what's wrong. I would say that my r/r is probably toast...it was a decent mosfet based one and only a year old, so there must be something else wrong with the system. Taking the r/r out of the equation I tested the ohms and all three wires were showing 0.5ohms. Next tested the continuity with ground on all 3 wires...no continuity, so that's fine. Tested the stator output and at 5000 revs it's showing 49 volts on each wire. The readings should be a minimum of 60v each. Does anyone know what would cause such a low output?

25-09-19, 09:18 PM	#2
johnnyrod Member Mega Poster Join Date: Jul 2003 Location: Doncaster, oop norf Posts: 2,122	Re: Stator test with low voltage output Are you doing it with the RR disconnected? I would have said 75V minimum but yeah 49 is low. Are you sure of the accuracy of your multimeter? Using it on AC mode not DC? Connecting it to a pair of wires from the stator, not to anything else? Sure you don't have any continuity to earth? If in doubt, double check all this stuff.

25-09-19, 09:55 PM	#3
JaxintheUK Junior Member Join Date: Jul 2019 Posts: 23	Re: Stator test with low voltage output Yes, the r/r is disconnected. I used two different multimeters, so I know it works OK. Yes, it was on AC not dc. Definitely no continuity to earth. I've been reading a brilliant thread on here for testing everything, so I'll be checking everything again tomorrow.

26-09-19, 07:19 AM	#4
Seeker Member Mega Poster Join Date: Jun 2016 Location: NE Lincs Posts: 1,069	Re: Stator test with low voltage output Broken/weak magnet on rotor?

26-09-19, 09:54 AM	#5
JaxintheUK Junior Member Join Date: Jul 2019 Posts: 23	Re: Stator test with low voltage output That's what I'm thinking. It's always something...I've spent so much time fixing the bike that the summer has passed me by.

26-09-19, 10:09 AM	#6
Seeker Member Mega Poster Join Date: Jun 2016 Location: NE Lincs Posts: 1,069	Re: Stator test with low voltage output I'd check the magnets for tightness and then I'd fit a new R/R (since your old one was overcharging) and see what your battery voltage is at idle and at 2k rpm.

28-09-19, 12:13 PM	#7
JaxintheUK Junior Member Join Date: Jul 2019 Posts: 23	Re: Stator test with low voltage output I re-did the stator check, as I was doing it wrong...I was doing it to ground. At idle I have 30vac and 5000 revs its 100vac on all three pairs. Is this OK? I have a new r/r from a gixxer, is the voltage too high, or is it fine...I don't want to blow this one. Last edited by JaxintheUK; 28-09-19 at 12:15 PM.

28-09-19, 01:04 PM	#8
GeorgeRYoung Member Join Date: Aug 2019 Posts: 48	Re: Stator test with low voltage output The manual just says more than 60V at 5000. My opinion is it should be fine. __________________ 65 CB160 (67-69), 69 350GTR (69-72), 72 R5, 73 RD350 (73-84), 82 XZ550 Vision (84-03), 01 Concours C10 (03-19), 89 EX250 (11-14), 00 SV650S (14-16), 03 SV650S (19-)

28-09-19, 07:50 PM	#9
JaxintheUK Junior Member Join Date: Jul 2019 Posts: 23	Re: Stator test with low voltage output It seems to work well, a nice 14.5v on the battery. It's made my day Then it started raining. lol

29-09-19, 08:57 AM	#10
glang Member Join Date: Oct 2007 Posts: 537	Re: Stator test with low voltage output good news but still hasnt answered why the original RR failed. You didnt jump/bump start the bike with a flat battery at some stage did you? In fact how do you know the battery died of overcharging? Also was the RR cooled as best as possible?

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