Question about 1995 Honda VF 750 C Magna

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Battery is not charging. Only 11-12V at best at 3000 rpm.

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  • feb52 May 27, 2010

    Thanks for the quick response. Turns out the regulator/rectifer was bad. The stator checked out fine.

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Check the voltage output of the alternator,

Posted on May 26, 2010

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1995 s320 charging system. getting 13.8 at B+ terminal of alternator; however, voltage at battery is less indicating to me there is no charge being sent from alternator to battery. diagram?


Hey Anon, What RPM are you checking the "at battery" voltage... Rev the engine to about 3000 RPM,, you should get 13.5+ volts.. if not, while running >> CAREFULLY<< try disconnecting and reconnecting the terminal at the alternator,,, this sometimes "excites" the alternator and makes it start charging again..

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Charging system puts out 14.5 volts at 3000 rpm, but starts to discharge while idling.


3-Step Honda SOHC Charging System Troubleshooting

www.motorcycleproject.com/text/SOHCcharging.html
It has the same charging system as the later DOHC fours, therefore go here to troubleshoot it. ... When the battery reaches 14.5 volts, the regulator interrupts the field coil's power feed, ... Start and rev the engine to 3,000 rpm. ... (one-piece system), putthe paper clip and jumper in the same place, but in this case connect the ...

Jan 23, 2016 | Motorcycles

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Charging output is 14.5 volts at 3000 rpm but at idle it discharges the battery.


replace the voltage regulator
14.5 volts should be at 2000 rpms
It may be best to have the alternator bench tested by an accredited auto electrician as there could be a brush issue

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2002 jaguar xj8 when I drive it won't go over 3000rpm


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1 Answer

I have a 2001 flhtcui what are the ac reading coming from stator at 2.5k rpm 3k rpm and 3600 rpm. At 2000 rpm I get about 12 volts dash guage reading but at 3000 I get 13.5 to 14 at lower rpm 2000 or so I...


The AC output of the stator should be 32-40 volts at 2000 RPM (16-20 per 1000 RPM). With the battery fully charged, your regulator should supply between 13.5 and 15.0 DC volts to the battery. This should be the reading you get on your voltmeter. It will vary depending on what lights and other equipment you have turned on. Sounds like everything is working fine to me. The gauge is reading the DC voltage at the battery while the engine is running. At 2000 RPM, 12 volts is a little low but, considering the accuracy of the gauge, as long as it doesn't fall below 12 volts, it's about right. You don't ride for extended periods at engine RPMs that low. Then at 3000 RPM, 14 volts is about right. If your bike never ran anymore than 12 volts, your battery would slowly go down. If it goes any higher than 15.0 volts, it will boil the battery. Usually, about 14.3 or so with no load on the system is about right.

Good Luck
Steve

May 17, 2011 | 2001 Harley Davidson FLHTCUI Electra Glide...

1 Answer

I have a charging problem on a 06 mod harley davidson street bob.how do i test the alternator?


AHHHH the old charging system problems, lol.

Your stator is located on the left side of the engine (as your sitting on it), behind your primary(behind your compensating sprocket, and rotor). Yes, this is a little complicated to diagnose but I will try my best to help you out.

1. Start your bike, and put your multimeter on your battery(black to neg. and red to pos.).
2. at idle you may read 11.5-13.5 Volts, this is normal. now when you rev the engine to 3000 RPM your Voltage should jump to no more than 14.7 or very close to it. If it stays low It could be either your stator or regulator. If its way higher, you need a new regulator. But first, lets test the stator. Turn the engine off.

Locate the stator wires directly in front of your oil filter, see it going into the inner primary?? Ok follow those wires to the regulator, in fron of the frame kind of by the oil filter and front motor mount, but connected to the frame. OK, go it?? Unplug the stator from the regulator. Now your gonna be testing the stator so dont even worry about the regulator. Now that you have the wires from the staor in your hands ( your hands should be filthy by now, lol)

1. Set your multimeter to Volts AC. Youll be going to about less than 100 VAC so set it max off 100 or 200.
2. Remember that this is a 3 phase system so you should 3 pins, so youll have 3 readings, Pin 1-2, pin 1-3, and pin 2-3.

3. Touch your mutlimeter probes to pins 1 and to pin 2, with the engine on and at idle, you should be about 20-30 VAC around there.
4. As you rev the engine, you should jump about 20 VAC per 1000 RPM. This means that at 3000 RPM you should be reading about 60-70 VAC. Do this test with the other pins. Pin 1-2, pins 1-3, pins 2-3. You should have about the same readings on all of them, and, your readings should be steady, and not drop off or gain alot.
5. Remember about 20 VAC per 1000 RPM. But, dont go over 3000 Rpm.

Results:
1. If the AC voltage at the stator is steady at 3000 RPM at about 60 VAC., but, battery voltage stays at 13V at 3000 RPM with stator and regulator hooked up, You got a bad regulator.
2. If your not getting a good AC voltage from the stator, your stator is bad.
3. If the AC voltage from your stator changes drastically as you go up in RPM (meaning as you slowly go up in RPM the AC Voltage goes from 10 Volts to 60 Volts back down to 20 volts.) You have a bad rotor.

Thats pretty much the basics, lol. Also open your clutch cover and smell your primary, if its an overwhelming disgusting burnt smell, and your clutch is working. 99.9% you have a burned stator and needs replaced.

May 12, 2011 | Harley Davidson Boulevard 400 Motorcycles

1 Answer

2000 ultra wont charge, iread how to troubleshoot found problem to be stator is it a complicated repair and where is it located thanks


AHHHH the old charging system problems, lol.

Your stator is located on the left side of the engine (as your sitting on it), behind your primary(behind your compensating sprocket, and rotor). Yes, this is a little complicated to diagnose but I will try my best to help you out.

1. Start your bike, and put your multimeter on your battery(black to neg. and red to pos.).
2. at idle you may read 11.5-13.5 Volts, this is normal. now when you rev the engine to 3000 RPM your Voltage should jump to no more than 14.7 or very close to it. If it stays low It could be either your stator or regulator. If its way higher, you need a new regulator. But first, lets test the stator. Turn the engine off.

Locate the stator wires directly in front of your oil filter, see it going into the inner primary?? Ok follow those wires to the regulator, in fron of the frame kind of by the oil filter and front motor mount, but connected to the frame. OK, go it?? Unplug the stator from the regulator. Now your gonna be testing the stator so dont even worry about the regulator. Now that you have the wires from the staor in your hands ( your hands should be filthy by now, lol)

1. Set your multimeter to Volts AC. Youll be going to about less than 100 VAC so set it max off 100 or 200.
2. Remember that this is a 3 phase system so you should 3 pins, so youll have 3 readings, Pin 1-2, pin 1-3, and pin 2-3.

3. Touch your mutlimeter probes to pins 1 and to pin 2, with the engine on and at idle, you should be about 20-30 VAC around there.
4. As you rev the engine, you should jump about 20 VAC per 1000 RPM. This means that at 3000 RPM you should be reading about 60-70 VAC. Do this test with the other pins. Pin 1-2, pins 1-3, pins 2-3. You should have about the same readings on all of them, and, your readings should be steady, and not drop off or gain alot.
5. Remember about 20 VAC per 1000 RPM. But, dont go over 3000 Rpm.

Results:
1. If the AC voltage at the stator is steady at 3000 RPM at about 60 VAC., but, battery voltage stays at 13V at 3000 RPM with stator and regulator hooked up, You got a bad regulator.
2. If your not getting a good AC voltage from the stator, your stator is bad.
3. If the AC voltage from your stator changes drastically as you go up in RPM (meaning as you slowly go up in RPM the AC Voltage goes from 10 Volts to 60 Volts back down to 20 volts.) You have a bad rotor.

Thats pretty much the basics, lol. Also open your clutch cover and smell your primary, if its an overwhelming disgusting burnt smell, and your clutch is working. 99.9% you have a burned stator and needs replaced.

May 03, 2011 | 2000 Harley Davidson FLHTCUI Electra Glide...

1 Answer

Battery light on but if rpms are up to 3000 battery light goes out until rpms drop lower than 3000


If your battery is good, this means your alternator is not charging at the lower RPM as it should -- so you need to check for a loose belt that may be slipping, or the alternator needs work or replacement.

Jun 16, 2010 | Cars & Trucks

2 Answers

1996 honda VT1100c2 backfiring & missing when accelerating


Replace Fuel Filter.
Test fuel pump output.
Remove and service carburetors.

Jun 07, 2009 | 2005 Honda VT 1100 C2 Shadow Sabre

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UPS not charging


Sir, Our UPS is not charging at all. After following the procedure for shuting and starting up, it show battery charging 0%. The model is MGE Galaxy 3000 UPS and also cooling fan is going to falt mode .with best regards

Jul 02, 2008 | MGE Galaxy 3000 UPS System

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