Question about 2002 Honda VFR 800
Hi this might help,normally if the alternator/generater fails you will get no charge voltage at all,if your bike is fitted with an alternator(most later honda models are)then you will have a rectifier and regulator,the rectifier converts the ac voltage from the alternator to dc voltage which is then fed through the regulator and then onto the battery,if the bike is fitted with a generator then you will still have a regulator but no rectifier,a generator develops dc voltage at its source so a rectifier is not needed,a simple way to test the system is with a simple digital volt meter,these are very cheap and reliable and can be got for around 20 bucks,with the engine running at about 1500 -2000rpm test the voltage across the battery with the meter normall voltage at charge should be between 13.8 and 14.8 volts,if you are getting more that this then the regulator is faulty,another way to test the regulator is to slowly lift the engine rpm from idle through to about 3 or 4000rpm the voltage across the battery should not rise any higher than about 14.2-14.8 and it should reach its peak at about 2-2500rpm and not fluctuate more than about 1 volt across the rev range,if the voltage exceeds about 14.8 or fluctuates excessively with engine revs then the regulator needs to be replaced.hope this helps...cheers ian
Posted on Feb 07, 2010
See My Postings On Battery Related Problems Elsewhere At This Website. All Charging Systems Use The Same Principle. Magnetic(Permanent) Rotor And Wound Stator Produces (AC) Current To Rectifier. Rectifier Changes This Current To (DC) Current And Regulates It At 14 To 13.5 Volts To The Battery. Regulators Also Provide Signal For Electric Tachometers (R.P.M.). Do No Jump Starting Or Rapid Charging. Very Expensive Damage Will Occur.
Posted on Apr 23, 2013
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Posted on Jan 02, 2017
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