Question about 2006 Yamaha V Star Classic

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Charging problem replaced bat and voltage reg, at start up voltage 12.50 dc, after 20 min run time voltage dropes to 11.50 dc. on a 2 to 3 hr trip bat will not start bike, bat will charge back to normal

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Hi
As the battery & regulator/rectifier have been replaced, the only other things to check are :-
Continuity from reg/rect red wire to battery & to earth, then check for continuity between each of the 3 yellow wires, all should be the same resistance - if not the stator coils in the alternator are faulty

Ride safe
Bike-Doc
Please mark this as very helpful (if it has been!!)

Posted on May 06, 2010

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Posted on Jan 02, 2017

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Mid 90,s custom harley build w. 32 amp sys new everything stator puts out 48 v. 2 new regs both ck ok. only bat v. at bat. simple 1 wire to bat. puts out 12.3 at 3000 rpm. sugestions?? anybody???


check for a missing wire to the battery as the voltage regulators are not controlling anything
if you have a 32 amp alternator and it is producing 48 amps , the voltage regulator is not controlling the out put of the stator so it will burn out from overload
voltage from the stator has to be 13.2 volts DC minimum and no more than 14.5 v DC at 2,000rpms
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Lisa I'M sorry to say their isn't any fuse or fuses that can correct problems with our alterator.Their is what is called a fuseable line witch is basicaly reistance wire that will burn out if over loaded .However you would have nothing even with a new battery NO CRANKING.
The ALT .uses diodes it is AC alternating currant unlike DC direct current..The diodes olny allow the currant to flow in 1 derection and uses a voltage regulator to allow the systems that are DC the battery to charge and at the same time other systems that run on AC voltage to work as well .
Your best bet is to talk it to somebody who you trust and test what you get at the battery with the vehicle running if it reads 14 volts at the top of the battery DC then the ALT IS GOOD , Check the BAT , at this point with the NEGITIVE cable off the BAT. It should read at least 12 volts DC on a 20 volt Dc scale.
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Hey Terry Stevens,you responded to my question,(how hot should the voltage regulator of my 92 FZR 600 get) and it is what it is the three white wires coming out of the alternator were hard and burnt...


It's normal for the reg to heat up this I'd how they reduce the current from AC to DC and convert the excess voltage to heat. You need to test your charging rate with a multi-metre set it to 20 DC Volts you should get between 13.5 V to 14 V if it is above 14 there is z problem that needs sorting possibly need to replace the reg. Regards Jim.

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amps or volts
11 to 12 amps indicates nothing but if it is volts then it indicates that the alternator is not charging the battery
Battery voltage is 12 -13.5 volts and when charging is 14.5-14.8 volts dc
the rest of your statement indicates that the alternator or voltage regulator is faulty and you should have the charging system checked by an accredited auto electrician

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I have gone through 2 new batteries in less than a month,how can i tell if my stator is bad on my 2004 xbr1200 firebolt


W running measure voltage at bat w/ vom should be 13.5 V 200 rpm 14.2 V ..good charged bat not running will be 12.65 V If u aint getting these voltages running could be reg is bad or stator ...good luck good help I found also harleytalking.con.....

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Never take the cable off when running. Its so hard on the voltage reg. And the alternator. Take the alternator and get it tested free at auto-zone or O rilleys. they test mine free all the time. Hope this is helpfull .. Sawdust46

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Wire connector between stator & voltage reg/rectifier burnt


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Put a new alternator in 2000 Jeep Grand Cherokee engine light on


well , the ECU runs the alternator. (DG wire "dark green")
the alternator field is controlled 100% by PCM reg , inside PCM.
so..... if the running engine has 13.3, to 15vdc the alt is working
if lower, its not. (rpm on engine 800 or more)

not scanning the PCM a the CEL glow, you missed the boat.
why not scan it. see why the PCM is upset (DTC errors stored)

see the 2 lower pins below , those go to PCM.
in theory if the field in the old BAD ALT, was shorted.
that could in fact, burn up the PCM regulator.
shorting outputs of PCM , does that in most cases.
im the poor sod that fixes PCM's.so....

1946421-gyllgess1dmtl30sgxtyvqv2-3-0.jpg

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