Question about kawasaki VN 1500 Vulcan Classic Motorcycles

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I have a Kawasaki VN88, 1500, Battery is not charging, new battery installed and charged and will start engine but after awhile I cannot start the motor because the battery is dead. Battery is not re-charging.

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Its either the alternator or the voltage regulator that has packed up.
Unplug the the cable from the regulator and using a multimeter to read ohms measure between all the 3 yellow wires, they should be between 0.3 and 0.5 ohms.
If ok then its probably the regulator.

Posted on Jun 23, 2009

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Hi and welcome to the site,

Almost always, your described problem would most likely indicate a faulty rectifier / regulator combo.  Other possibilities are loose or corroded terminals on the connectors from the stator to the regulator (3 yellow wires) or the output wire of the regulator to the battery + line.

The connectors / terminals could be visually inspected and thereafter cleaned. The regulator could be checked with a voltmeter. At idling, battery voltage should be arounf 12.7 + while would go up to 14.5 as the RPM is increased.

Would appreciate updates.

Good luck and thank you for using FixYa.

Posted on Jun 23, 2009


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Hi, Parke you have a bad battery or faulty charging system, now it is time to put on your Battery Priest Robe and prepare yourself for the Ceremonial "LOAD TEST" but before you begin, maintenance type lead-acid batteries must be topped off with distilled Holy Water and all batteries must offer their terminals to the battery charging altar to receive the Sacred Infusion of Holy Ions until they have reached a 100% full charge of 12.5 volts or better. No matter how new the battery is, do not be lured into the false sense of "it's OK it has 12.5 volts" and not doing the test below, it could have little or zero "AMPERAGE" causing the battery to be faulty and must be replaced, AGM maintenance free batteries fall into this scenario more so than lead-acid types.
Below is a quick and easy test to see if your battery is in good condition or needs Last Rites and must be replaced.
1. Make sure the bike is in "NEUTRAL"
2. Disconnect the spark plug cables.
3. Adjust voltmeter to DC volts 20-volt range
4. Place the voltmeter leads to the battery terminals.
5. Turn the run/off switch to run.
6. Turn the ignition switch on and press the starter button.
7. Watch the voltmeter as your engine turns over for 10 seconds.
8. If the voltage drops below 9.6 volts, the battery is faulty and must be replaced I "HIGHLY" recommend a maintenance free AGM battery they typically have more amperage for cranking.
9. Reconnect the spark plug cables if your battery is good and the bike starts ok, place the voltmeter leads on the battery and rev the engine to a steady 2500 RPM the voltmeter should read 14.5 volts DC anything in the 13's or less you have a charging issue that needs to be diagnosed and repaired.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Battery won stay charged Kawasaki Vulcan 750 Forum Kawasaki VN750 Forums
Test Your Battery in 10 Seconds Reliable Load Test with Only Multimeter
Kawasaki VN 750 Service Manual
OEM Parts for Kawasaki
1995 Kawasaki Vulcan 750 Owner Manual

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