Question about 2006 Suzuki GS 500 F

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Charging problem I wonder if you can give me the output readings from the alternator as I wish to resolve a charging problem. Obvious solution would lie at the voltage regulator, but at £80 I wish to rule out the alternator first.

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For the classic GS range there is an excellent web site. From where I was able trouble shooted my electrical problems very well. Voltage regulators rarely cause problems. Mostly it is the altenator, or the battery. The regulator only makes dc from ac current.

Posted on Nov 10, 2008

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How to check alternator output

with engine running you should be able to check alternator output on the battery. put your leads on the positive and negative post and see if it reads more then 12 volts DC. usually charges at 13-13.5 volts

Apr 24, 2016 | 2005 Suzuki Boulevard C90

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How do you check the alternator/charging system on a 2002 Dyna Low Rider?

Speaking generally about bike electronics and not to your specific model I would recommend the following. ALWAYS BUY A MANUAL FOR THE BIKE. This will have the specs you need.
What speed are you running the engine at when you do your test?
If engine speed is too low you will get a low reading. Check the manual for the ideal tick over speed and be sure that you have the rate right. Run the engine at 5000 rpm and test again to see if you get a rise in voltage output above battery level. 13.5 to 14.5 is OK.
Next, check the connections carefully. If there are loose or corroded connections, tighten and/or clean them. Check ALL the wiring to and from the alternator. Often that is the problem and it is foolish to condemn a perfectly good alternator and replace it, only to find the problem still exists. Most charging problems on bikes are caused by corrosion at the connections. On the other hand, a short will simply cause new components to also fail. Check carefully.
Once you have done that, load up the alternator by turning everything electrical on and checking the output voltage again. You are looking for at least battery voltage + .5 volts and if you get a little more than that, the alternator is fine.
If you have an external voltage regulator/rectifier and the voltage is still low, replace it and try again.
Next make sure that the system is cooling correctly. Some bikes use both air and oil cooling for the electrical charging system and both need to work well or the system will break down due to excessive heat.
Your battery should read between 12.4 and 12.8 volts. If not, it will need checking and possibly replacing. Under 12v dump it.
Now check the OHMS rating for the stator. This is done by checking the output wires (Disconnected and typically three wires) from the stator. Check the specifications for your bike, but typically you need to find a reading between 0.1 AND 2 OHMS. Check across all three wires. Then check there is no short to the case from all three wires with the meter still in OHMS setting. If there is and you get a reading, the stator is dying and needs replacing.
You may not be able to test the rectifier/regulator but if you can do so, check the manual for the specs and then test it accordingly.
Next you need to check the output voltage of the stator. Again, your manual will give you the exact specs but generally speaking you are looking for around 75 volts AC.
Ground the black lead from the meter to an earth point on the bike. Any good earth point will do.
With the leads from the stator disconnected, start the bike and run it at 5000 rpm. Check the AC voltage (set the meter to AC voltage) and make sure it is the same reading across all the wires (typically, three wires). As I said, typically around 75 volts.
A lower than spec reading will indicate a stator or rotor problem and replacement is going to have to happen.
Hope this helps.

Aug 25, 2014 | 2002 Harley Davidson FXDL Dyna Low Rider

1 Answer

My charging system is not charging the battery ?

Could only be wiring, voltage regulator, or the alternator itself.
Most alternator's have replaceable brushes wish wear out over time, a bit involved but not too difficult. Have a cheap voltmeter on hand and work your way back looking for bad wires.
This is the time a couple bucks spent for a service manual from say amazon for example, will give you simple step by step instructions,, the manual will save you so much frustration you wonder how you ever got by with out it.

Aug 17, 2014 | Motorcycles

1 Answer

2001 Electraglide Ultra..battery won't charge. Where do I test the output of the Volt. Reg.?

Hi Thomas, perform the following tests:
1. Fill acid type batteries to proper levels.
2. Charge battery overnight at 1-2 amps you need 12.5 volts or better after charging.
3. Hook up battery positive cable, then with your multimeter on the milliamp scale connect one lead to the negative battery post and the other lead to the ground cable. Meter should read 3 milliamps or less, 10 milliamps with a radio, 15 milliamps with radio and CB. If your meter reads higher you need to isolate the circuit by pulling fuses and circuit breakers one at a time and observe meter for drop in aprerage then get out your test light and track down the short in that circuit.
3. Make sure all connections are clean and tight especially the negative cable at both ends.
4. Hook up volt meter to battery and start engine, if meter falls below 9.5 v while cranking replace battery.
5. With engine running at 3600 RPM battery should read 14.3-14.7 volts if not continue tests.
6. Unplug voltage regulator from alternator at crankcase by front of primary cover.
7. To test voltage regulator go to:
8. With ohm meter, one lead grounded, touch alternator pin meter should read infinity, if not replace stator.
9. With ohm meter, both leads touching alternator pins meter should read 0.1 to 0.2 ohms on 1989 and later models. 0.2 to 0.4 ohms 1988 and earlier models, if not replace stator.
10. With volt meter set on AC scale, both leads touching alternator pins meter should read
16 to 20 volts AC for every 1000 RPM'S 1989 and later and 19 to 26 volts AC for every 1000 RPMS. If not replace rotor.
17. For a free wiring diagram please visit the website below and good luck.Harley Davidson Wiring Diagrams and Schematics

Nov 18, 2012 | 2001 Harley Davidson FLHTCUI Electra Glide...

1 Answer

Replace alternator or drive making noise not charging battery

To check the charging system, first make sure you have a fully charged battery in the bike. You'll need a DVOM (digital volt ohm meter). Set the meter's function selector switch to DC VOLTS, 50 volt range. Connect the red meter lead to the positive battery post and the black meter lead to the negative post. Start the engine and bring it to a high idle. After a minute or so, your meter should read between 14.5 and 15.0 volts. If not, proceed to check the output voltage of the alternator.

Follow the two black wires from the voltage regulator down to the connection on the front of the engine. Unplug the connection and look down inside the engine side of the connector. You'll see two metal contacts. Make sure they are clean. This is where you're going to put your meter leads to read the output of the alternator. Since it is an AC voltage, it makes no difference which meter lead goes to which contact as long as they don't touch each other or the engine case. Put your meter's function switch to AC VOLTS, 50 volts or greater range. Start the engine and bring it to a high idle. Touch a meter lead to each of the metal contacts. You should read at least 30 Volts AC. If not, your alternator stator is likely bad. If you do read the 30 volts or more at the alternator but not the 14.5 to 15.0 volts at the battery, your voltage regulator is likely the problem. Make sure your voltage regulator has a good ground against the frame.

If your alternator is not charging and is making a noise down in the primary, make sure you check the magnets in the rotor. They have been known to come loose making a noise and damaging the stator.

Good Luck

Jun 01, 2011 | Harley Davidson DNA 50 Motorcycles

1 Answer

My Bike Wont Charge The Battery And Need To Know How To Test The Alternator Output?

put a test meter (reading VOLTS DC in the 20V range) across the battery terminals. It should read 12V. Now start the engine. The reading across the battery should be 13-14V or so. If it is any less, then the alternator isn't charging. If it goes up a lot when you rev it then the voltage regulator is faulty. Hope this helps.

Feb 23, 2011 | 1979 Moto Guzzi V 50 I

2 Answers

1999 harley sportster will not charge the battery but, will run. however it will not keep running if you try to accelerate. i'm inclined to think it's the voltage regulator. but i'm not sure

To test the charging system, first you need a fully charged battery in the bike. With a fully charged battery, start the bike. Using a DVOM (digital volt ohm meter) put the red lead of the meter to the positive battery post and the black lead to the negative post. Put the meter in DC volts, 50 volt range. Bring the engine to a high idle and you should read between 14.5 and 15.0 volts at the battery. If you read this much, your charging system is operating as it should. If not, procede to check your alternator output.

If not, look for the connector that connects the alternator to the voltage regulator. Disconnect the connector. Now, going into the connector on the alternator side (the wire that comes from the left side engine case) test the output of the alternator. Put your meter in AC volts, 50 volt range. Notice we're measuring AC voltage now. Put one lead of the meter to each of the pins in the plug. Since it's AC voltage, it make no difference which lead goes where. Now start the engine and bring it to a high idle. You should read somewhere around 25 volts or higher. If you read this much voltage, your stator is good and your regulator may be bad. If not, your rotor is most likely bad.

One reason for a regulator not working correctly is lose of a good ground. Take the regulator off the frame and put a "star washer" (serated lock washer) between the regulator and the frame and tighten the mounting bolts. This will restore the ground on the regulator. If this doesn't help, the regulator is probably bad.

Good Luck

May 31, 2010 | 2001 Harley Davidson XL Sportster 883...

1 Answer

Sometimes i get spark on all 4 plugs sometimes only 2 and battery dont charge what do i look foe

First check condition of the coils by swapping them over .if the two failing sparks swap to, the coil is shot, also clean the connections an wires a good earth is inportant. AS for the battery if left uncharged for more than 2 -3 months will be shot. check alternator belt if you have one, my zxr does .about 5mm slack if o.k check alternator output put voltage meter set to 12v d.c on the battery and gently raise engine revs, as you do the voltage should go up to about 2-4v extra on a charged battery.which has been cranked a few times to take full charge out of the battery.a fully charged battery will not need the power and give a false reading.

Feb 09, 2010 | 1995 kawasaki VN 750 Vulcan

2 Answers

Harley Davidson battery went dead after riding 20 miles during the day. I rode my Harley Dyna Super Glide (2002) about 10 miles, made a stop and then rode 10 miles back. I stopped to get gas about 1 mile...


You charged the battery off of the battery charger with a trickle charge. The battery wouldn't charge while you're riding, because your alternator took a cr@p.
(Sorry if I seem gruff, but I'm an old biker, and Harleys are all I ride. I'm also a Harley mechanic.
Shhhh! I don't want that to get around! lol!)

3.Battery is at 13.4 volts now? What is the specific gravity of the acid in each cell? Don't have a hydrometer? Do you have a load tester? No? Since you measured the voltage, do you have a multimeter?

Test the voltage with the bike running. It should be around 14.6 volts when charging, less with the battery fully charged.
Don't get the correct reading, then you better look at alternator replacement. (Regulator is built in)

Jul 13, 2009 | 2002 Harley Davidson FXD Dyna Super Glide

1 Answer

Battery not charging after a long run

With the squealing in first and second gear, I would suspect the noise was coming from the clutch. You may only need an adjustment, and not a replacement. If your ZXR is set up like my brother's Kawasaki EX-500 (and most other motorcycles) the alternator is built into the engine case on the opposite side of the crankcase from the transmission output shaft and there is no alternator belt. If there is no problem with the alternator windings, the problem may be in the voltage regulator. In either case, unless you are a very talented amateur mechanic and/or electrical engineer, you are better off taking it to the shop.

Mar 18, 2009 | 1990 kawasaki ZXR 750

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