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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 4 Jul 2017
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Electrical / Charging woes
Hey folks, my 1999 XT600E is giving me grief with the electrics and charging. First the battery drains; it charges well on the wall charger but in just one or two short rides it drains again. I took it to the shop fully charged for testing under load and it was dropping to 8v.

The regulator / recitifier seems to be working ... in the garage anyway! A new battery gives me 12.7v, at idle around 13.8v and at revs 14.2v.

1) I noticed however that revs do not brighten the headlamp!
2) During the last night ride I noticed that when switching-off from bright gives me only the side lamp .... but flicking on & off the bright switch again gives me the normal lights
3) The new battery does not drain overnight when parked ... so can I assume no current leaks?
4) What is my next step? Pulling the stator and check for resistance? Anything else?

Thanks in advance for any help!

Regards,
Chris
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  #2  
Old 4 Jul 2017
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Sounds like Stator
Hi Chris

A mate of mine has just had similar problems with his Triumph charging (but no symptom of light switch issue you describe).

Checked all connections etc and also fitted a new battery which kept charge for a few days then died.

Turned out it was a fried stator so that's what I would check next on your XT


Good luck

Steve
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  #3  
Old 4 Jul 2017
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no need to dismount the stator for a check, just unplug it, check that resistance between the three spade connectors, should be about 1 ohm and that none of them is grounding.
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Old 4 Jul 2017
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Run a ground wire from the battery neg. post to one of the reg/rect. mounting bolts to verify it's still grounded good . I mounted mine on the airbox intake when I build my E-start bike and the bike would only run till the battery hit the shut-down voltage for the TCI . It showed charging voltage but due to no grounding of the reg/rect. wouldn't go into the battery .

I'd think if the stator was bad it wouldn't show normal volts at idle and then higher volts when rev'd plus be right in spec. I'd guess somethings going on with the light/light switch or wiring shorting out when running and draining the battery.
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Old 5 Jul 2017
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Thanks to All for taking the time to reply, will check on the pointers you gave me. Regarding the stator, if it turns out to be the culprit, would a rewind be worth the time and money? Or is best to buy a new one? In that case, are there any aftermarket ones better than OEM?
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  #6  
Old 5 Jul 2017
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My mate bought a pattern one and hasn't had any problems since fitted 3 months ago. It was roughly half the price of OEM as well. Here is the link for the company he used

Electrex World Ltd | Electrex World Ltd

Cheers
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  #7  
Old 7 Jul 2017
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update
So, ended up taking it to a shop as I didn't have the time to do it myself. The guy checked all the main harness, alternator, the phases, ac and dc, the ground, r/r, the switch etc. Only found just a very tiny bit of corrosion on like 20% of connectors ..... everything checked out fine. He even checked with a hot bike. I hate when this happens as now I will be commuting with the risk of being stranded.

Anyone has any more suggestions?

Thanks.
Chris
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  #8  
Old 7 Jul 2017
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charging sounds ok

how old is the battery?

could be on its way out...

two quick checks

disconnect one pole and run it through your meter on amps settings

with switch off current should be zero amps, switch on, lights off, under 1 amp or so

with battery still disconnected and charged, check Volts and then check again in 12 or 24 hours, should drop by just few tenths. if more then its self discharging badly
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Old 9 Jul 2017
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Some electricals don't lend themselves to be accurately so they may test fine but actually fail under steady load for a period of time . I'd be tempted to buy a new R/R and possibly a battery if it was getting old anyways or I had other uses for another battery .

Possibly swapping out the light switch if there seems to be a headlight issue when switching to low if a new bulb didn't solve it.
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Old 12 Jul 2017
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So far the new battery seems to be holding up well, and in combination with the cleaning of the connectors etc. might have done the trick. Thanks all for the help mates.
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Old 4 Jan 2018
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Hello there .... Happy New Year!

I'm having issues again with a drained battery. Before pulling the trigger on a new R/R ... does anyone here run with a battery status monitor ... the ones ones with the flashing LEDs that tell you the voltage status?

Also, re. the R/R .. I had read that a MOSFET type lasts much longer and is more efficient than the normal type. Does our XT have a MOSFET one? If no, is anyone aware if there is one that fits the XT?

Thanks a bunch!

Chris
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Old 4 Jan 2018
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I have a small voltmeter on mine, fitted through a relay.
Something like this: https://www.ebay.com/itm/LED-Display...QAAOSwSQFaIPPu
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  #13  
Old 5 Jan 2018
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Quote:
Originally Posted by Kukku View Post
Hello there .... Happy New Year!

I'm having issues again with a drained battery. Before pulling the trigger on a new R/R ... does anyone here run with a battery status monitor ... the ones ones with the flashing LEDs that tell you the voltage status?
Mine is much like this one:
https://www.ebay.co.uk/itm/12V-Motor...IAAOSwQS1aQiw-
It monitors the battery - it has it's own on/off switch, so it doesn't drain the battery - and it has two outlets for charging USB stuff.
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  #14  
Old 6 Jan 2018
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Just get yourself a new regulator rectifier!

Here:
https://www.ebay.com/dsc/i.html?_fro...ator+rectifier

Buy two or three if you want even to keep as spares.. Yes, they are cheap but they are just as good or even better than stock since some of them have cooling fins on them.
And they cost as little as 8 USD

If you need a stator, they also have it on ebay for 35 USD
https://www.ebay.com/itm/Stator-Coil...BZNcZV&vxp=mtr
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  #15  
Old 10 Jan 2018
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Thanks guys, I went ahead and bought this voltage monitor which I wanted anyways:

http://gammatronixltd.com/epages/bae...fbe/Products/A

Where do you reckon is best to hook it up so that it works only when the bike is running? I would also like to install a double USB charger on the bike so potentially I should hook both to the same place.
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Last edited by Kukku; 10 Jan 2018 at 14:22.
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