dodgy electrics - SV650.org

19-02-06, 05:36 PM

hi sv650.org,

a friend of mine is having trouble with her sv650 - one that I recommended that she buy - so I'dlike to help her get it sorted if I can. it's a '98 model or thereabouts - the curvy shape

the problem seems to be that the battery discharges to the point that the engine cuts out & won't restart. checking the voltage gives ~10v so obviously it's getting pretty well discharged. it has had a brand new battery & it's still doing the same, although it takes a little longer to discharge now. I've checked the voltage across the battery with the engine running & it's ~14v, so it certainly seems like it should be charging

if anyone has any bright ideas they would be much appreciated!!

many thanks

~andy

19-02-06, 06:32 PM

It looks like a dodgy regulator/rectifier connection somewhere, you should have about 14V or more while the engine is running.
Sod's law states that when you check it, all will be working just fine but will go open circuit at the farthest distance from home.
Some peep's on here have mentioned bad regulator units, I'd check all connections and wiring before replacing the unit.

Sid Squid · 19-02-06, 07:51 PM

Reg/rec is a known weak spot of the SV, but there are other possible problems too.

I've posted several times on checking charging circuits, do a search there's plenty on here.

19-02-06, 11:33 PM

it is not uncommon for the RR to test good, until fully warmed up then it doesn't test

Heat is the enemy of semiconductors

embee · 20-02-06, 12:11 AM

Like they say.

You indicate that it seems to be seeing 14V (ish) at the battery while running, yet it's discharging. If the battery is good (from what you say that's most likely), then it clearly isn't getting 14V otherwise it wouldn't go flat.

The SV Reg/rec is renowned for failing, from what you describe it'd be where I'd look first.

Electrex has been suggested on here before as decent equipment.
http://www.electrexworld.co.uk

22-02-06, 11:03 AM

thanks for the suggestions, they rather confirmed what I was thinking re. cabling and/or reg/rec. I will investigate further & report back with the solution

many thanks

~andy

19-02-06, 05:36 PM	#1
weazelz Guest Posts: n/a	dodgy electrics hi sv650.org, a friend of mine is having trouble with her sv650 - one that I recommended that she buy - so I'dlike to help her get it sorted if I can. it's a '98 model or thereabouts - the curvy shape the problem seems to be that the battery discharges to the point that the engine cuts out & won't restart. checking the voltage gives ~10v so obviously it's getting pretty well discharged. it has had a brand new battery & it's still doing the same, although it takes a little longer to discharge now. I've checked the voltage across the battery with the engine running & it's ~14v, so it certainly seems like it should be charging if anyone has any bright ideas they would be much appreciated!! many thanks ~andy

19-02-06, 07:51 PM	#3
Sid Squid No, I don't lend tools. Mega Poster Join Date: Jul 2003 Location: Skunk Works, Nth London Posts: 8,680	Reg/rec is a known weak spot of the SV, but there are other possible problems too. I've posted several times on checking charging circuits, do a search there's plenty on here. __________________ If an SV650 has a flat tyre in the forest and no-one is there to blow it up, how long will it be 'til someone posts that the reg/rec is duff and the world will end unless a CBR unit is fitted? A little bit of knowledge = a dangerous thing. "a deathless anthem of nuclear-strength romantic angst"

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19-02-06, 06:32 PM	#2
OldBoy Guest Posts: n/a	It looks like a dodgy regulator/rectifier connection somewhere, you should have about 14V or more while the engine is running. Sod's law states that when you check it, all will be working just fine but will go open circuit at the farthest distance from home. Some peep's on here have mentioned bad regulator units, I'd check all connections and wiring before replacing the unit.

19-02-06, 11:33 PM	#4
RandyO Guest Posts: n/a	it is not uncommon for the RR to test good, until fully warmed up then it doesn't test Heat is the enemy of semiconductors

20-02-06, 12:11 AM	#5
embee Member Mega Poster Join Date: Jul 2003 Location: Warwickshire Posts: 2,804	Like they say. You indicate that it seems to be seeing 14V (ish) at the battery while running, yet it's discharging. If the battery is good (from what you say that's most likely), then it clearly isn't getting 14V otherwise it wouldn't go flat. The SV Reg/rec is renowned for failing, from what you describe it'd be where I'd look first. Electrex has been suggested on here before as decent equipment. http://www.electrexworld.co.uk

22-02-06, 11:03 AM	#6
weazelz Guest Posts: n/a	thanks for the suggestions, they rather confirmed what I was thinking re. cabling and/or reg/rec. I will investigate further & report back with the solution many thanks ~andy