Hi all,
My beloved old GS is acting up again.
I have been having issues with flat battery of late. I replaced the battery with a brand new one as the origional was past its best anyway. But after a few days commuting, the battery goes flat.
I charged the battery and left it overnight, checked the voltage and got 12.48V.
I starded the bike and tested again, 13.09V.
then at 4000 rpm i tested it and got 12.5V.
so I measured it a full chat (10,000 rpms or so) and still only got 12.5V.
It would appear that their is a small amount of charging at low revs (idle) but that quickly drops off to nothing as soon as the revs increase.
Does anybody have any ideas as to what this may be? All connections are good and clean as are the earths on the bike.
I would hate to have to retire her now, I was so hoping to get 200k miles out of her, but I dont want to invest much miney into her at this stage in her life.
Maybe you should test the charging system---http://gstwins.com/gsboard/index.php?topic=38480.0
Is the new battery faulty??? or alternator/rectifier? or the connections between them??
Good luck, i hope everything will be ok ;)
Gradual lower and lower voltage @ the battery is a sign of a burning/burn stator coil.
regulators are electronic, they dont have a capacity to partially fail or work at a lower level. Its all or nothing with those.
Alternaotrs and to be more precise stators OTOH behave mechanically albeit some times in a more rapid fashion.
My stator on my vulcan took 6 months to die. It will slowly burn from 100% to about 90%, past that it burns quite faster ... it would go to 50 % in the time it took to drop from 100-90, and 50% to 0 is pretty quick too.
Exponential rate of failure. But gradual none the less.
Cool.
Buddha.
Yes check the whole charging system to be sure but I've had exact same symptoms
and he fault was with the R/R , GS has a weak one as some other suzuki models (sv650 :icon_rolleyes:)
I'm on my second one and it failed too ,ordered one from Ebay for '08 GSXR1000 ,it's more robust but
requires some soldering to fit original connectors, I'll report once I get it (it has 7 wires instead of 5 on GS)
thanks for the replies,
This evening, I checked the resistance of the stator coils and they seem good.
With the engine running I get a no-load voltage of 73-78V at low revs and 135-138V at higher revs. I think this would be enough, right?
The wiring is good and all connections are clean and in good order.
Do the above voltages sound high enough ? If so, I will start looking for an inexpensive reg/rectifier.
cheers for the help so far.
Quote from: oobyscoot on December 01, 2009, 02:05:56 PM
This evening, I checked the resistance of the stator coils and they seem good.
With the engine running I get a no-load voltage of 73-78V at low revs and 135-138V at higher revs. I think this would be enough, right?
The wiring is good and all connections are clean and in good order.
Exactly like mine,at 5000 rpm and up more than 110 VAC ,alternator checks up fine,replaced with another GS R/R from older model
and it lasted couple of months and gave up,the best R/R is of MOSFET type instead of SCR, it comes in Honda/Yamaha latest
bikes(R1/CBR...) designated as model FH###, if you can get one of these cheap it's a good deal if not any other of
the latest sportbikes will do as well,more robust and reliable :thumb:
UPDATE-----> http://gstwins.com/gsboard/index.php?topic=51021.0 (http://gstwins.com/gsboard/index.php?topic=51021.0)