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Charging issue? Charging issue?
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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 10 Jun 2009
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Charging issue?
Ok, my Xt600e engine puts out 13.5 or so volts at idle but at higher rpm the voltage drops, probably not below 13v. Haven't done a full load test as the exhaust is a 'little' loud and i have neighbours, also my ears would likely bleed.
Im thinking reg/rec throttling too much under load? Any suggestions, diagnosis or tests? Is this normal for the xt and what would normal operating temperatures for the reg/rec be?
For the record all connections are cleaned up for good contact.
Thanks!
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  #2  
Old 11 Jun 2009
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check standing voltage across battery if you have a standing voltage of above 12.5 i'd say charging system standing voltage lower than 12.5v battery is prob on its way out, the voltage on mid revs should be about 14.5volts.
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  #3  
Old 11 Jun 2009
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Battery isnt in great condition, holds 12.5 after charging, basic lead acid so 12.6 max. The reason i ask is that im used to a blip of the throttle causing the headlights to brighten and the opposite is true here.
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Old 11 Jun 2009
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sounds like the charging system is faulty check all the wiring from the engine up to the reg/rec they sometimes rub through on the frame and also check the earths and connectors
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Old 11 Jun 2009
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Sounds like the regulator/rectifier.

Voltage should increase with RPM then settle. 14.5 should be the max at a guess.
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Old 11 Jun 2009
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Ok an update. Did a few tests, on a warm engine so will have to repeat cold. 1.5ohm between the 3phases. Infinite ohm between each and earth. And about 20V ac at idle between the three. No obvious damage to wiring so im guessing the reg is the problem.
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Old 11 Jun 2009
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Tested the reg/rec according to the Electrosport flow chart and it checks out fine! Guess have to check higher rpm ac volts next then new battery.
Edit: is the problem using a standard lead acid battery in place of the standard Xt maintenance free version?
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Old 11 Jun 2009
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the oe battery is a lead acid battery anyway so that is not an issue.
did you check the phase wiring at the reg/rec plug or just at the engine harness connector, as the wiring between the engine harness and reg/rec is where rubs on the frame.
if it tests ok check all earths/ground connections all over the bike, if they are all good i'd say reg/rec.
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Old 11 Jun 2009
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Get yourself a new reg/rectifier off flebay, I bought a new one a few months ago for 34euros with s/h delivered at home (Azores - Portugal).

Haven't tested it yet tho but it'll work

If you end up getting one and it's not that problem, you got yourself a spare! YES you'll end up sooner or later having to change it!


Vando
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Old 11 Jun 2009
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I'd agree with that. I had almost identical symptoms a few weeks ago, and it was the reg/rec. They seem to go pretty regularly, so a spare wouldn't hurt. I'm cross about hearing people getting them on eBay, though - mine was GBP70 odd. Ouch.
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Old 11 Jun 2009
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which ebay you go shopping at?
most of the times I get my stuff from the .COM a very few times on .CO.UK and .DE

sometimes you can even look at the spanish ebay..a few little things come up once in a while


Vando
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Old 11 Jun 2009
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Im gona repeat my readings then test the bike with a newish battery, just to be sure, but im sure you guys are right about the reg/rec. Im a poor student so would prefer to be spend as little as possible, would a reg/rec off another bike work? I cant see why not except with regard to loads. Or is this false economy?
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Old 12 Jun 2009
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Battery
If the bike is starting easily with button, then the battery if most likely good.

A battery can read 12.5VDC and be useless.
To test a battery you must measure it under load. What this means is that you must draw current from it while testing with the multimeter.

Easiest is to turn on your headlight to brights and have flickers on at same time. Should draw a good few watts, simply add all the bulbs wattages together to know how much. Bike should not be running at this point.
Now measure the battery and see how many volts DC you get. If it drops below 11,8VDC it may be time to replace. A battery should not be discharged below 10,8VDC.
Many battery shops have load test facility and will usually test for free. But you can test yourself as above.
Happy testing. Remember to study in-between bike riding.
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Old 12 Jun 2009
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As for the regulator/rectifier i bought 32£, here:
VOLTAGE REGULATOR for YAMAHA XT 600 E TT 600 K NEW - eBay (item 380109097873 end time Apr-06-09 16:20:53 PDT)
That was the one I bought..

If you try and reach the seller perhaps he'll sell them again?
I unno...

Vando
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Old 12 Jun 2009
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Quote:
Originally Posted by bacardi23 View Post
which ebay you go shopping at?
Always .co.uk so far, out of sheer habit. If there's cheaper stuff on the others, I will have a look. Thanks.
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