How to determine fault in charging system

[Widowmaker]

I recently bought a 2007 Lightning 12S, long story short I rode it a couple times with no issue, went out of town for a week, came back and rode it to work about a 20 min ride, almost to my destination the engine light came on, as I was pulling into the nearest parking lot all instruments went black and the needles went to zero. I stopped the bike and turned the key on and off the gauges came back but it didn't have enough juice to start. I didn't know when a new battery had been installed on the bike so I decided the easiest thing was to get a new battery so I could get the bike home. Replaced the battery and it fired up, I drove it home. I checked the battery voltage and it is definitely not charging. The system doesn't have a draw when the key is off. I am trying to figure out the proper way to isolate the component that is not working. Any tips or advice how I should go about this is greatly appreciated.

 

[anrkizm95]

 

[anrkizm95]

if your not sure about the diag i can talk you through it over the phone

 

[sharrison8]

I'm having the same kind of issue, my engine light will come on midway thru a ride and will not start right after i turn it off. But if I wait 20mins or so it will start right up w/ no light.

Does that sound like the same kinda issue?

 

[Widowmaker]

Sharrison8,

Hmm, no my bike just doesn't charge After running through the steps, it puts out the proper AC voltage at 2000 rpm so the book says that means the voltage regulators is bad. Now I need to get a new regulator and hopefully that will fix my charging problem.