Diagnosis please - Battery vs Reg/Rec vs Other - SV650.org

15-04-09, 08:34 PM

Bike hasn't been starting (other than jump / bumping it)

So picked up a multi-meter and took some readings -

Bike off - 12.5v
Try to start it (unsuccesfully) - 12.01v
Bump start it, idling with no lights - 14.5v
Idling, no lights, rev it to 5k, drops to around 13.8-14.1v
Lights on, idling - 13.8v
Lights on, rev to 5k, 14.2v

Bizarrely i noticed today, when riding home, that when i was sitting in traffic, lights on... if i revved, sometimes the lights seemed to get duller (ties in with the drop in voltage when revving above) yet other times it got brighter....

So, is my battery fubared or is it the reg / rec..... ??

TSM · 15-04-09, 08:38 PM

Did you test with lights on hi-beam?

When you said, "try to start it", was the the voltage as it turned over or after you stopped turning the engine?

15-04-09, 08:41 PM

No just full headlights, not highbeam... and after i tried turning it over...

If i left the bike running for a few mins it then turned it off the reading was about 12.8v and gradually dropped to about 12.5 within about 5mins...

15-04-09, 08:42 PM

Sounds like the charging is off so start from there.

On second thoughts, it could be the battery.. I'd suggest trying a good battery off a mates bike or something and if it starts then, but it could be a mixture of both. The irregular charging fried the battery, etc.

TSM · 15-04-09, 08:44 PM

The voltages seem roughly comparable to mine, the idle voltage is over 14v on mine.

Retest with hi-beam as thats how it should be tested.

15-04-09, 08:46 PM

What bout the drop in voltage when revving, is that not odd??

TSM · 15-04-09, 08:49 PM

Quote:

Originally Posted by chris_c201

What bout the drop in voltage when revving, is that not odd??

not realy, its way over 13v and on 14v which is not bad

whats yr idle revs? a 100revs +/- can vary the voltage quite a bit.

Does your bike start off the battery?
How old is battery?

Quote:

Try to start it (unsuccesfully) - 12.01v
Bump start it, idling with no lights - 14.5v

what was the sequence of events to get to the 12.01v?

Biker Biggles · 15-04-09, 09:03 PM

Connections all good?Battery and earth straps,and the live one to the starter motor.

15-04-09, 09:20 PM

Idle is 14-1500rpms when warm

I've only had the bike a few weeks, to begin with it started off battery, was only this week it started playing up. Not sure of age of battery, think from memory the guy said it had been replaced fairly recently....

Connections to battery seem solid, not checked any others though....

Before going to 12.01v i put the ignition on, waited on fuel light going out then tried turning it over until it died....

yorkie_chris · 15-04-09, 09:24 PM

I'd say the battery was suspect.

15-04-09, 08:34 PM	#1
chris_c201 Guest Posts: n/a	Diagnosis please - Battery vs Reg/Rec vs Other Bike hasn't been starting (other than jump / bumping it) So picked up a multi-meter and took some readings - Bike off - 12.5v Try to start it (unsuccesfully) - 12.01v Bump start it, idling with no lights - 14.5v Idling, no lights, rev it to 5k, drops to around 13.8-14.1v Lights on, idling - 13.8v Lights on, rev to 5k, 14.2v Bizarrely i noticed today, when riding home, that when i was sitting in traffic, lights on... if i revved, sometimes the lights seemed to get duller (ties in with the drop in voltage when revving above) yet other times it got brighter.... So, is my battery fubared or is it the reg / rec..... ??

15-04-09, 08:38 PM	#2
TSM The Sick Man Mega Poster Join Date: Nov 2004 Location: Peckham.SE.LDN Posts: 4,768	Re: Diagnosis please - Battery vs Reg/Rec vs Other Did you test with lights on hi-beam? When you said, "try to start it", was the the voltage as it turned over or after you stopped turning the engine? __________________ OTR: KTM 690 Duke R 2015 Full Akro SIDELINE: Kwak ZX636 A1P 2002, Red, R&G's, Yoshi, Double Bubble Screen GONE: Kwak ZX-7R P1, Full Akro, Undertray, Screen GONE: SV650S K2 Very Bruised & Without Fairing, Motovation Frame Sliders, R&G Ally Sprocket Toe Protector, HEL 2 Line Setup, GSXR K1 600 RWU Forks, Barnett Clutch & Springs, Penske 8981 Shock, Gilles Ti Rearsets, Steel Barends, Scottoiler, AFAM Chain & Sprockets, Twin FIAMM Horns, Skidmarx Bellypan, Full Micron Zeta Steel System, Cut down undertay. Forum Problems & Information / Site Suggestions

15-04-09, 08:41 PM	#3
chris_c201 Guest Posts: n/a	Re: Diagnosis please - Battery vs Reg/Rec vs Other No just full headlights, not highbeam... and after i tried turning it over... If i left the bike running for a few mins it then turned it off the reading was about 12.8v and gradually dropped to about 12.5 within about 5mins...

15-04-09, 08:42 PM	#4
Jamiebridges123 Guest Posts: n/a	Re: Diagnosis please - Battery vs Reg/Rec vs Other Sounds like the charging is off so start from there. On second thoughts, it could be the battery.. I'd suggest trying a good battery off a mates bike or something and if it starts then, but it could be a mixture of both. The irregular charging fried the battery, etc. Last edited by Jamiebridges123; 15-04-09 at 08:45 PM.

15-04-09, 08:44 PM	#5
TSM The Sick Man Mega Poster Join Date: Nov 2004 Location: Peckham.SE.LDN Posts: 4,768	Re: Diagnosis please - Battery vs Reg/Rec vs Other The voltages seem roughly comparable to mine, the idle voltage is over 14v on mine. Retest with hi-beam as thats how it should be tested. __________________ OTR: KTM 690 Duke R 2015 Full Akro SIDELINE: Kwak ZX636 A1P 2002, Red, R&G's, Yoshi, Double Bubble Screen GONE: Kwak ZX-7R P1, Full Akro, Undertray, Screen GONE: SV650S K2 Very Bruised & Without Fairing, Motovation Frame Sliders, R&G Ally Sprocket Toe Protector, HEL 2 Line Setup, GSXR K1 600 RWU Forks, Barnett Clutch & Springs, Penske 8981 Shock, Gilles Ti Rearsets, Steel Barends, Scottoiler, AFAM Chain & Sprockets, Twin FIAMM Horns, Skidmarx Bellypan, Full Micron Zeta Steel System, Cut down undertay. Forum Problems & Information / Site Suggestions

15-04-09, 08:46 PM	#6
chris_c201 Guest Posts: n/a	Re: Diagnosis please - Battery vs Reg/Rec vs Other What bout the drop in voltage when revving, is that not odd??

15-04-09, 09:03 PM	#8
Biker Biggles Member Mega Poster Join Date: Jan 2005 Location: Barnet Herts Posts: 5,071	Re: Diagnosis please - Battery vs Reg/Rec vs Other Connections all good?Battery and earth straps,and the live one to the starter motor. __________________ On a clear day we stand there and look further than the ordinary eye can see.

15-04-09, 09:20 PM	#9
chris_c201 Guest Posts: n/a	Re: Diagnosis please - Battery vs Reg/Rec vs Other Idle is 14-1500rpms when warm I've only had the bike a few weeks, to begin with it started off battery, was only this week it started playing up. Not sure of age of battery, think from memory the guy said it had been replaced fairly recently.... Connections to battery seem solid, not checked any others though.... Before going to 12.01v i put the ignition on, waited on fuel light going out then tried turning it over until it died....

15-04-09, 09:24 PM	#10
yorkie_chris Noisy Git Mega Poster Join Date: Apr 2007 Location: Halifax/Leeds Posts: 26,645	Re: Diagnosis please - Battery vs Reg/Rec vs Other I'd say the battery was suspect. __________________ Currently Ex Biker Now rebuilding a 63' fishing trawler as a dive boat

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