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  #1  
Old 7th September 2018, 06:30 PM
kildare09 kildare09 is offline
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Biker.ie Member No. 14299 from Kildare
411 posts since Feb 2009
Motorbike: Yamaha r1 big bang
Modifications: Ah sure you know yourself
Default Possible regulator rectifer problem.

Evening all.
Having what I think is a problem with my reg/rec,
Recently replaced the battery on the bike with a new one because after a few days of not getting used it was dead. All fine once I replaced and charged the new battery noticed that at idle battery voltage was 13.5 and when the fans came on dropped to 12.8. So disconnected the output plug from the regulator and was showing 15.7 volts, so I hooked up a separate battery directly with the regulator and got a reading of 14.2.
Seems to be putting out the voltage until it gets put under load is this possible??
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  #2  
Old 7th September 2018, 06:35 PM
joe williams joe williams is offline
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Biker.ie Member No. 23271 from tipperary
730 posts since Aug 2010
Motorbike: zx6r.cr 500sm. ktm950 sm.
Modifications: black duct tape
Default Re: Possible regulator rectifer problem.

If you reg was gone it would over charge and boil the battery . U sure its not a drain on your battery .
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  #3  
Old 7th September 2018, 09:23 PM
DavyH DavyH is online now
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Biker.ie Member No. 34191
2,228 posts since Dec 2014
Motorbike: Cb,Vtr,Xrv,Nt
Modifications: A few bits and pieces!
Default Re: Possible regulator rectifer problem.

Reg can go either way... Over or under charging. If the voltage is dropping off with load it's worth checking the AC output at your stator.... You might be down on a phase or 2
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  #4  
Old 7th September 2018, 10:04 PM
kildare09 kildare09 is offline
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Biker.ie Member No. 14299 from Kildare
411 posts since Feb 2009
Motorbike: Yamaha r1 big bang
Modifications: Ah sure you know yourself
Default Re: Possible regulator rectifer problem.

Cheers for the replies lads. Out with a different reg rec tomorrow, and check the out put of the stator.
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  #5  
Old 7th September 2018, 10:23 PM
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nednedned nednedned is offline
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Biker.ie Member No. 5106 from Dubzland
2,196 posts since Apr 2007
Motorbike: BANDIT 600 x2
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Default Re: Possible regulator rectifer problem.

Check the a current draw from your battery when all is turned off. There will be some if there is an alarm.

Last edited by nednedned; 8th September 2018 at 01:17 PM.
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  #6  
Old 7th September 2018, 11:11 PM
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Spoonman Spoonman is offline
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Biker.ie Member No. 1842 from Westmeath
3,828 posts since May 2005
Motorbike: '87 NC24; '98 TL1000S
Modifications: TLS: M4 system, PCII, K&N, GI-pro ATRE, c/f hugger
Default Re: Possible regulator rectifer problem.

That reg sounds perfect - wouldn't touch it.

How old was the battery you replaced?

Fans dropping 0.7V could be normal, not something I've ever measured before so can't say for sure - fans can draw a decent whack of power though so I wouldn't rule it out. In any case it's nothing to do with the reg at that point, that's all down to the strength of the battery and the power draw of the fans.

If you loosing power in storage then either the battery has an internal problem (which is highly unlikely in the case of a new one) of there's some quiescent load. In that case, as ned says above, a current check with a multimeter and the ignition off will answer that one pretty quickly for you.
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  #7  
Old 8th September 2018, 09:06 AM
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ascalon ascalon is offline
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Biker.ie Member No. 2683 from The seventh ring...
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Motorbike: VF1000 F, ZXR-R
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Default Re: Possible regulator rectifer problem.

This could still be the reg/rec.

I had a bad one recently where it tested fine until the bike was fully warmed, at which point the voltage to the battery dropped well below 12v.

Swapped it out for an aftermarket item and have not had a problem since.

When the bike is warm, see if the reg/rec itself gets hot, and I mean hot, that can be an indicator, same with the plug to the stator.

Look up online too, there are easy checks for both stator and reg/rec testing with a multimeter.
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  #8  
Old 9th September 2018, 03:21 PM
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chopper chopper is online now
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Default Re: Possible regulator rectifer problem.

Originally Posted by kildare09
Evening all.
Having what I think is a problem with my reg/rec,
Recently replaced the battery on the bike with a new one because after a few days of not getting used it was dead. All fine once I replaced and charged the new battery noticed that at idle battery voltage was 13.5 and when the fans came on dropped to 12.8. So disconnected the output plug from the regulator and was showing 15.7 volts, so I hooked up a separate battery directly with the regulator and got a reading of 14.2.
Seems to be putting out the voltage until it gets put under load is this possible??
do you have the original one still?, iirc there was a recall on them . maybe ring priory and ask.have your frame number handy .
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  #9  
Old 9th September 2018, 07:31 PM
kildare09 kildare09 is offline
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Biker.ie Member No. 14299 from Kildare
411 posts since Feb 2009
Motorbike: Yamaha r1 big bang
Modifications: Ah sure you know yourself
Default Re: Possible regulator rectifer problem.

Thanks chopper, iv changed bikes two a big bang yamaha r1 now forgot to change my details.
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  #10  
Old 9th September 2018, 07:34 PM
DavyH DavyH is online now
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Motorbike: Cb,Vtr,Xrv,Nt
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Default Re: Possible regulator rectifer problem.

Originally Posted by kildare09
Thanks chopper, iv changed bikes two a big bang yamaha r1 now forgot to change my details.
Check the stator
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  #11  
Old 10th September 2018, 08:46 PM
kildare09 kildare09 is offline
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Original Poster of This Thread Topic Starter
 
Biker.ie Member No. 14299 from Kildare
411 posts since Feb 2009
Motorbike: Yamaha r1 big bang
Modifications: Ah sure you know yourself
Default Re: Possible regulator rectifer problem.

Checked the stator working perfectly. New reg rec on order.
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  #12  
Old 10th September 2018, 09:49 PM
DavyH DavyH is online now
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Biker.ie Member No. 34191
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Motorbike: Cb,Vtr,Xrv,Nt
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Default Re: Possible regulator rectifer problem.

Originally Posted by kildare09
Checked the stator working perfectly. New reg rec on order.
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