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Hello So I own a 1990 750 Vulcan and I'm having eletrical problems. I have to put the battery on the charger for a couple hours if I want to use it. Why is that when I turn my ignition switch to on my battery voltages drop from 15v to 10? The bike wont keep charge it will ride for about 15-20 miles then it stalls. When I go to get a jump it comes on but about 3 minutes down the road it stalls?

I just brought a new battery for it A new RR and relocated it to the side of the bike instead of under the battery The battery is good i think it should its brand new so why wont it keep charge other than that she runs great?

Thank you for any help with this problem
 

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You need to test the stator. the R/R won't do much good if the input from the stator is bad.

Search for "stator test" ...there are lots of discussions and instructions on it.

If the stator is good, then you must have a short somewhere. You can start by pulling fuses out of the fuse box to eliminate certain things....but do the stator test first!!

here is one link that will explain how to test it with a meter to check if the windings are good.
http://www.vn750.com/forum/showthread.php?t=12333&highlight=Stator+Test
 

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Hello So I own a 1990 750 Vulcan and I'm having eletrical problems. I have to put the battery on the charger for a couple hours if I want to use it. Why is that when I turn my ignition switch to on my battery voltages drop from 15v to 10? The bike wont keep charge it will ride for about 15-20 miles then it stalls. When I go to get a jump it comes on but about 3 minutes down the road it stalls?

I just brought a new battery for it A new RR and relocated it to the side of the bike instead of under the battery The battery is good i think it should its brand new so why wont it keep charge other than that she runs great?

Thank you for any help with this problem
Old batteries die and sometimes a brand new battery will be defective.
On the other hand, if you have had the battery installed and working properly for a few days or weeks, it will probably give you several years of trouble free service.

As a quick test to see if the stator and r/r system is charging, the headlight should get brighter as engine speed increases from an idle.
 

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Discussion Starter · #4 ·
Hey thanks for the response and helpful information. I'm gonna complete these test on the link you gave me tomorrow once I get off of work I will post them on here. - Another the battery may be defected I'm gonna test it, it's been charging fine and reading at 13v once I take the charger off but once the bikes on it drops rapidly. - Now that you mention a SHORT AND THAT THE HEAD LIGHT SHOULD GET BRIGHTER, As I was pulling into my drive way I used only the front brake and the head light got completely dimmer and I held it for about 15 seconds and it shut the bike down - will not start. It's back on the charger in the morning It will be ready to go for another 15 miles . ?

I appreciate all your help thanks folks
 

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I have a 1994 vn750 its a great bike and have had carbs and battery replaced. I as well have the same issue. I can only ride for about 45 minutes. It seems to nit hold a charge for very long and the fan never kicks on. I've noticed an issue with the key ignition being loose. The key not being in the correct location and nothing comes in. I have had the bike shut down on me before and then it wont restart.
 

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Joe, first your need to rebuild or replace your ignition switch. There’s one on eBay right now:

Next you need to put a voltmeter on your battery, start the bike, and measure how much voltage you are getting to charge your battery.
 

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Another guy was having very similar problems last week. Haven't heard whether he's had success yet, but there's some info in the thread that might be useful to you.
 

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Joe, first your need to rebuild or replace your ignition switch. There’s one on eBay right now:

Next you need to put a voltmeter on your battery, start the bike, and measure how much voltage you are getting to charge your battery.
Where can i find the rebuild kit for it.
 

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Respectfully, the ignition switch is probably not the problem. While it is often the cause of bikes shutting off due to faulty contacts (basically flipping the kill switch), it would never cause the battery to drain.
 
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