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electrical fault

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caswellfoggy
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Posts : 2

electrical fault

Post by caswellfoggy on Thu 16 Feb 2017, 6:47 pm

Help please, took the wifes cb500 1998 out for a ride today. started fine then on the way home after 38 miles the bike stopped. would not start again as the battery was flat, had to get my daughter to give me a jump start. rode home 2 miles stopped the bike and the battery is flat again. any help appreciated.
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Jameshambleton
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Posts : 1912
Location : Bedale, North Yorkshire

Re: electrical fault

Post by Jameshambleton on Thu 16 Feb 2017, 6:54 pm

Check the regulator rectifier. 

Also check the battery voltage when you press the starter anything 9 volts or lower means that the battery has a dead cell and needs to be replaced.
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caswellfoggy
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Posts : 2

Re: electrical fault

Post by caswellfoggy on Fri 17 Feb 2017, 7:55 am

many thanks for that, will check it out today.
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teamster1975
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Posts : 2480
Location : Woking, Surrey

Re: electrical fault

Post by teamster1975 on Fri 17 Feb 2017, 9:45 am

Would be worth checking battery voltage with the engine running as well, looking for 14v ish when you rev the engine. Does the headlight get brighter when you rev the engine?
Best of luck!
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Crash- Elmit
Running out of unique names
Running out of unique names

Posts : 182
Location : Rothwell, Nr Kettering

Re: electrical fault

Post by Crash- Elmit on Fri 17 Feb 2017, 6:19 pm

I had the same problem last year.

As James pointed out, its going to be the reg/rec. I believe there is a thread on here about uprating to a better reg/rec, as the oem ones(and some from Ebay) get too hot due to not enough cool air getting to it
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Jameshambleton
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Posts : 1912
Location : Bedale, North Yorkshire

Re: electrical fault

Post by Jameshambleton on Fri 17 Feb 2017, 6:46 pm

@Crash- Elmit wrote:I had the same problem last year.

As James pointed out, its going to be the reg/rec. I believe there is a thread on here about uprating to a better reg/rec, as the oem ones(and some from Ebay) get too hot due to not enough cool air getting to it

This one http://www.cb500club.net/t3130-charging-battery

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Re: electrical fault

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