CBR 600F 1987 - 1990 CBR 600F Forum

Low battery voltage

Old May 23, 2021 | 02:47 AM
  #61  
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in my excitement I didn’t check but I will next time. Would be a shame if it were over charging the battery


Originally Posted by Liam Kemsley
she’s back on the road. The replacement R/R came and I’m getting 14.4 volts at idle.

I took her for a spin, got up to around 120. Something else feels off now. I hope it’s just my imagination!

thanks for all the help guys!!! My bike is saved.
 
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Old May 23, 2021 | 03:50 AM
  #62  
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Great news, bet that is a relief
 
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Old Jul 26, 2021 | 01:11 PM
  #63  
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My bike was turning over slowly and it used to just spin and start, so I figure the battery is 3 years old and maybe a new one is in order, but I wanted to check the old one anyways. So off came the side pieces and the seat and the battery was 12.2, a tad low, so I started it and checked the voltage , 14.4, good right ? then my elbow touched the frame near the voltage regulator, wowzers was it hot like sweet snapping hot. I started to read and the Honda is a SCR system which do generate lots of heat. I read more and found that newer units use a Mosfet regulator which runs a lot cooler, so I have ordered a Mosfet regulator, which comes with a plug adapter and should fit. Once I get it and install I will do an evaluation and tell you
 
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Old Jul 27, 2021 | 11:18 AM
  #64  
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Default Not charging at idle, again.

3000+ revs it’s over 14v

when settling down at idle, it was jumping around 12-13+v. Even up to 14 on occasion.

it settled lower in low 12v and then high 11v.

another knackered regulator?
 
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Old Jul 28, 2021 | 09:33 AM
  #65  
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, That would be a very poor show if it is!!!!
 
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Old Jul 28, 2021 | 11:19 AM
  #66  
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Originally Posted by Al1040
, That would be a very poor show if it is!!!!

it would indeed. I noticed the indicators would Get brighter when I revved. When I first got the rectifier, I was so excited that it worked, I didn’t check the idle revs. Just checked when it was warming up.
 
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Old Jul 28, 2021 | 01:12 PM
  #67  
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I think to be fair my lights do brighten up when coming off tickover suggesting that there is only just enough power at idle for the bike to function, but not charge the battery. Not sure what the spec says but might not be an issue esp if you are getting the 14 or so volts when the bike is being ridden.
 
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Old Jul 28, 2021 | 01:17 PM
  #68  
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Originally Posted by Al1040
I think to be fair my lights do brighten up when coming off tickover suggesting that there is only just enough power at idle for the bike to function, but not charge the battery. Not sure what the spec says but might not be an issue esp if you are getting the 14 or so volts when the bike is being ridden.

That’s encouraging. I’ll have to stay aware and take reading regularly to see if things get worse or stay the same. I drove from London to wales and just arrived. No an issue throughout the entire journey.
 
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Old Jul 29, 2021 | 10:33 AM
  #69  
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Good to hear, let us know how you get on.
 
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Old Aug 6, 2021 | 04:53 PM
  #70  
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Default Battery regulator heatsink and yheal pastr

Originally Posted by Liam Kemsley
Battery at 11.82v with fan on and only 12.18 when at 5000rpm.

rectifier is too hot to touch.

How do I test the rectifier for issues?

I bought a new regulator battery, heatsink and thermal paste. The battery was 12.3 the new 12.9 The regulator was blazing hot so I replaced it and added a heatsink. I used thermal paste and applied dialectic grease to the pins and contacts .the total for everything came out to $105

New $15

Old part

Thermal paste

At 2000 rpm

At 4000 rpm

New parts


After 5 minutes it was still not hot

Dialectic grease
 
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