Maybe this problem�s been on this fora before, in wich case I apologize for being lazy not searching enough.
I have a tenere z -09. Love the bike but been having some problems lately. The loading stops working, the yellow light starts blinking and when I stop the battery is drained. Yamaha havn�t yet found whats wrong!!??
The first time it happened I found that the kontakt from the regulator was a bit black inside. I cleaned it and loaded the battery and it worked for a cuple of weeks. Then it happened again. Left the bike with Yamaha.(don�t want to screw up the guaranti ) They changed the cables from the reg. including the kontakt. It�s all put together as one pice and you�re not supposed to take it apart.
After a couple of weeks it happened again. This time I was stranded on a highway Yamaha picked me up in yust a couple of hours (good so far) Now they are saying they can�t seem to find the problem, they have run computeranalys, but that they will try change ing the wiring in the generator. I was planing going north by the high mountains in Sweden and Norway next week. Don�know if I dare now. Not a soul for quite long stretches sometimes and for certain don�t want to be stranded there. Anyone has any idea? Sorry about the English.

Rednax, search on 'Regulator' you will find lots of information about what happens and how to resolve it. You are correct, the terminals in between the reg / rectifier and loom are not making a good connection, hence not charging. Show this information to your dealer or better still get them to have a look at this web site.

Hope this helps.

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thankyou ! Getting to understand the problem now. Don�t know why the guys at Yamaha doesn�t seem to.

had my bike in Yamaha workshop for a week and a half now. A new bike with a fault covered by the guaranti !! Will probably get it back tomorrow. All plans for my vacation totally f-d up. They have changed the collector in the generator now...I now (after studying the different threads on this site) also realise what the yerking when I�m trying to go slow and even in the city is about. Thought it might be a fuel inj. adjustment thing, but it�s probably the rubber cushings back there...after 6000 km !! So what�s next ? I�m NOT feeling confident about taking this bike out on any real adventure. Maybe the good feeling will return when I�m on the bike again, ( I AM suffering from a case of bad bike abstinens and the time is 4:30 in the morning and I should really ) but I seriously doubt it . Don`t know what the knext problem will be.....It�s a real pity, such a sweet bike to ride. Also after this, I can�t say I love the Yamaha people here Even though I�ve had quite a few deals. bought two bikes (one for my daughter) and sold them one at a really good price, not to mention everything else I�ve bought, they made me feel really bad uring this process. Well, it might be I�ll visit the BMW dealer tomorrow or KTM or...so f-ck them!

If your bike has been fixed correctly you should not have any further problems with the regulator.

These XT660's are very reliable, with us knowing 99% of the problems with them. Hopefully your faith will be restored once you get back on your bike, time will tell.

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Mods that I have done to my XTX's

My 04 XTX
Stage 1 & 2 DNA filters / Kev fuel mod / snorkel mod / Drilled air box mod / Engine breather mod / Fork Spacer mod / 15w fork oil /
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My 07 XTX
Raptor 700 cylinder 102mm / Modified Crank Case to take a 105mm Raptor Cylinder / 11:1 102mm JE Raptor piston / Stage 1 Raptor Hot Cam / Ported head / Colder Spark Plug / +2mm Throttle body / DNA stage 1 & 2 filters / Modified Air Box / Snorkel removed / Worry Brothers stage 2 filter cover / 6mm & 8mm Bolts Replaced with Titanium Bolts / Recovered seat in Black / O2 Eliminator /

My 09 XTX
59HP at the rear wheel / Stage 2 Raptor Hot Cam / DNA stage 3 Air Box / Carbon Can Exhausts / Modified Exhaust Link Pipes / PCIII With Custom Fuel Map / Wideband Commander O2 Data logger / LCD100 Dyno Jet display & fuel adjuster / 2500 OHM HT lead instead of a 10K OHM XT lead / Extra Coolant Cooler / Protaper Fat Bars / Tail Tidy With LED Tail Light / OKE Protection Knobs / LED indicators / AIS blocked / Modified rear sprocket rubbers / Rear Foot Pegs removed / 09 ECU With 02 Sensor Changed To A 06 ECU / Complete wiring harnes Changed from 09 to 04 / Home made LED resistor flasher / Hole drilled in the fuel tank filler neck to allow quicker filling / Modified Bar End Weights / Progressive front fork springs, 15W fork oil, forks lowered 25mm, used XTR rear links lowering the rear 20mm, rear spring one click stiffer / Changed front & rear guards from blue to black / 47T rear sprocket / Speedo Healer V4.0 / Kev throttle cam mod / Throttle grip mod / The new 2010 O2 sensor mod is out, works a treat, The new 2012 O2 Controller is out, PM me for details

Now ride a 2018 MT09SP ABS + TCS

My KTM 990 SMR Mod book. http://www.ktmsmt.com/viewtopic.php?f=13&t=4946

finally got my bike back today and of course feeling a bit better after a ride. Still pissed though for loosing a great bit of my vacation and not getting the time to do the trip I was planning. The fix that was made...well, the collector is changed and the contact from the reg. is now smeared in grease and wrapped in electric tape..don�t know if you can call the last a good fix , but I guess they havn�t got anything better to offer allthough they really should imo. It can�t be that difficult or costly I think and it seems a lot of bikes have had the same problem..
Anyway, reading your tecnical advises on this site with great interest and looking with more optimism on the bike (for now) in hope that you are right. Thanks for your time.