Question about 1995 Honda VFR 400 R NC30

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Battery keeps going dead,would it be alt or regulator

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  • Dick
    Dick May 11, 2010

    There is no way to tell from the information you have provided. You need to explain the conditions that happen between fully charged and dead.

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Your regulator rectifer is bad

Posted on Jun 23, 2009

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Hi There, try the rectifier, very common on vfr 400 and rvf400.

Posted on Aug 05, 2009

  • Robert Smith
    Robert Smith Aug 05, 2009

    Hi There, try the rectifier. very common on vfr 400 and especially the rvf 400.

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1 Answer

Battery won't hold a charge, battery and alternator both check good. Where is the voltage regulator at on these vans?


Hey Rick ,I don't know what you have so it makes it harder to help you ,I don't dough you checked battery and alt . unless you have a dead short the battery should hold a charge , as far as the alt. most have an internal built in regulator , start the vehicle when its running disconnect the battery if it dies its the alt .

Nov 07, 2014 | Cars & Trucks

1 Answer

Battery light alternator


The Charge lamp comes on with the Alternator fails to keep battery charge going. (lots of way to fail, and ALT Is 100% good) it's a system. each part of it must be good, end to end.
so...
i put my voltmeter across battery, i start car, i see 13.3 to 15vdc, alt is good.
no? , i see now, 12.2v. ALt is dead, (i didnt say bad) and battery is sightly discharged, 12.6v is charged. (key off, rested voltage)
This 12v tells me the ALT is shut down. only why is the question.

how can any charge system fail,
bad battery tops the list here, they LOVE to fail.
1: belt slips.
2: belt missing
3: bad alt.
4: bad wires to ALT . (corrosion on any wire or lug)
5: fuses blown , any listed below.:
your alt is not an ECU controlled, alt ,its 100% self contained

did you ever remove the ALT and blow the 100 amp fuseable link
the first step of any alt pul, is the pull the NEG, battery lug or BOOM.

im logged in to alldata.com so can you.

and what do i see.
a 5 wire ALT. one is the frame ground, so it must not be rusty or..... it fails. frame to engine block. no rust here.

wire L , yellow.goes to dash LEDs (alt failure idiot lamps) (this works)
wire. S white goes to ALT 5a fuse, is it blown?
wire :B B/G color, goes to the 100 amp link fuse. (blown>?)
wire IG Red-white, goes to a fuse marked 10A gauge.

i think the IG wire is the voltage sense wire.
no sense, no charge. I think the whole I/P dash cluster goes dead when this fuse blows.

The S wire is the boot strap voltage sense, it wakes up the regulator .
if open , the reg stays asleep, as does ALT.
Alternators can not self start, the regulator has boot strap device
that cures that. called self excitation. so this wire is critical.
All wires except the L wire is critical. in this case.

the B wire is the big wire, it charges the battery . 50amps or more..

any of the 5 paths open , kills the ALT dead.
The REG inside the ALT can also shut it down.
eg: battery bad, with huge cell resistances. total.
eg: overvoltge for any reasons. including attempts top run car with no battery, (dont ask)
eg: over current (battery cells 1 to 6 shorted) or 25 KC lamps added.
eg: over temperature shut down.

that is about it.







Dec 31, 2013 | 2003 Toyota Matrix

1 Answer

2002 Ford Focus, driving down road, airbag light comes on, dashlights go out, engine runs rough then quits. Restarts, goes one block, quits again.


Symptoms of a charging system problem. The charging system comprises the alternator, battery and associated wiring. If the alternator should fail to produce a sufficient or stable enough voltage for the car's electronic systems - due to a wiring short, faulty voltage regulator, or corroded electrical connector, for example - the car will run off the "reserve" in the battery for a short time until the battery is eventually depleted. (The battery itself could also contribute to the problem if it has a faulty cell or for some reason is causing the alternator to put out an excessively high voltage in an attempt to compensate.)

So a couple of quick checks: Measure the battery voltage with the car off. Yours sounds like it will be dead; the clicking while attempting to start is the starter relay not getting enough juice. Then the question becomes: Is the battery dead because of age (fails to hold a charge) or because the alternator isn't charging it? To answer this question, measure the voltage at the battery with the car running. (Jump it or substitute a known good 12V battery.) You should see 14+V. If you only see 12V or less, you're seeing only the current battery charge without any contribution from the alt.

Finally, don't assume because the alt isn't putting out anything the alt is at fault. The wiring harness and electrical connector to the back of the alt should be thoroughly examined. (The wiring connector is a known failure point on early models.) The wiring harness should obviously show no signs of burning, melting or chafing and the battery terminals should be corrosion free and tight. If the harness checks out, remove the alt and have it bench tested. Rebuilding usually gives better long term reliability than chain store bought reman units, I'm told.

Long story short, I suspect the voltage regulator in your alternator failed, the battery gave it's all trying to keep your car running, finally gave up and now you have a dead alt and a dead battery. Don't just install a new battery without doing the alternator voltage output tests.

If you're really lucky it could be as simple as loose or corroded battery terminals.

Dec 31, 2012 | 2002 Ford Focus

2 Answers

Our 2001s type jaguar's battery (fairly new) keeps going dead after driving it maybe 20 miles or more. What do you think is causing this?


SOUND LIKE ALTERNATOR FAULTY, BUT FIRST CHECK FOR LOOSE OR SLIPPING DRIVE BELT. CHECK ALTERNATOR FUSE. CHECK ALTERNATOR BATTERY FEED WIRE AND VOLTAGE REGULATOR WIRES MAKE SURE NONE OF THE WIRES IS LOOSE, DISCONNECTED OR DAMAGED.

Jun 15, 2011 | 2001 Jaguar S-Type

2 Answers

Altemator charges then wont charge


worn brushes in alt may cause this.when stops charging knock on alt if charges replce it

Feb 13, 2011 | Nissan Frontier Cars & Trucks

1 Answer

Battery keep going dead, has new battery


Have you checked to see if the alternator is charging ? Run a volt meter on the battery with the engine running, have to have more than 14 volts. If 13 or less, then replace the alt.

Jan 18, 2010 | 2003 Chevrolet Venture Passanger

1 Answer

Not charging


First tell me why you don't think it's charging.
Because of the voltage reading you are getting at the battery terminals? The range you want is between 13.6v to 14.2v. The higher the voltage the lower the amps. and true the other way, the lower the voltage the higher the amps. If you get a reading of 13.6v or lower, the alt is nearing or at max output. An alt can only run at maximum for around fifteen minutes and it will start slinging solder from overheating. It's a good indication the battery is either totally dead or junk. Charging above 14.2 the alternater is running wide open and is only putting out high volts which will cause the battery to boil , in turn destroying it. This is a bad alternater. All alternaters have integrated voltage regulater with the exception of ver few of the earlier ones. You cannot test an alternater by removing a battery cable to see if the engine keeps running without taking great risk of damaging the alt, regulator. So tell me why you feel it isn't charging. Remember an alt is not made to charge dead batteries. Their sole function is to maintain the battery charge. Without a battery, the alt won't last 10 seconds.
Hope to hear from you and good luck.

Sep 23, 2009 | 1986 Chrysler LeBaron

1 Answer

I have a f-250, 2006 diesel, I have been having trouble with keeping a charge I just replaced both batteries. Today I was driving and accelerated to about seventy, The speedometer tacked out above 100 and...


sound like multiple problems....BUT test your ALT., a bad regulator will drain your BATTS. if not sure disconnect the termoinal and regulator plug from the ALT and sit O/Nite, retry in AM....This also can have an adverse effect to the electrical if it's OVERCHGING it don't like 14+ volts ....hope this helps you...GL

Jul 10, 2009 | 2006 Ford F-250 Super Duty

1 Answer

Dead Batt (poss. Alternator?)


Likely you did this already but check fuses in power distribution box near battery (likely two 60a fuses for alt in there). Additionally, was alternator regulator tested or was alt "full fielded" for test. (regulator failure will prevent power made at alt from reaching the battery). Also, check continuity of leads going to alternator to make sure they're OK.

Mar 09, 2009 | 1994 Jeep Cherokee Country

2 Answers

Dead battery. Alternator is charging, but the juice is not getting to battery. 1998 Slk 230. There is a relay p/n 002 542 20 19 05 3905 00, by the battery, (G) from the alternator has 19.8 volts, battery...


19.8 volts is too high. the alt regulator is not working. The regulator needs a battery source feed to work. Both the feed for the regulator and the connection between the output post and the positive battery terminal should go through an ALT fuse. Start by checking that.

Feb 28, 2009 | 1999 Mercedes-Benz M-Class

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