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81 GS750L Voltages

  • Thread starter Thread starter billko3333
  • Start date Start date
B

billko3333

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Can anyone tell me what the voltage should be with bike running around 5000rpm with headlight on and off. Mine is charging with light off @ 14.4v when light is turned on voltage drops to 13.5v then if I turn on my spot lights it drops to 12.4v. which doesn't seem to be high enough to keep battery charged. I have replaced the stator and regulator/rectifier. Or is there a heavy duty stator available that produces more power?
 
The voltages should be 14.5V but without knowing what you put on the bike (R/R) nor what lights and their draws are we wouldn't know what else to expect. And no there is no higher output charging system. Your best bet is to reduce loads using LEDs
 
I used the stator papers from this web site and found both stator and R/R to be bad. I replaced them with a new aftermarket stator and new aftermarket R/R both are supposedly OEM replacements. But why would voltage at battery drop close to 1 volt by just turning on the stock headlight? I understand this bike has a day and night charging system. Is it possible it is a wiring issue in the night part of the system? Or maybe a weak battery? The spot lights are H1 35 watt bulbs and provide great lighting. I really would hate to change them. They work fine on my 97 Honda Shadow so I got the same ones for this bike.
 
billko3333 said:
I used the stator papers from this web site and found both stator and R/R to be bad. I replaced them with a new aftermarket stator and new aftermarket R/R both are supposedly OEM replacements. But why would voltage at battery drop close to 1 volt by just turning on the stock headlight? I understand this bike has a day and night charging system. Is it possible it is a wiring issue in the night part of the system? Or maybe a weak battery? The spot lights are H1 35 watt bulbs and provide great lighting. I really would hate to change them. They work fine on my 97 Honda Shadow so I got the same ones for this bike.
Click to expand...

You apparently did not do the Quick Test, so you're asking bunch of questions that would likely be answered by those results.
Also based on your OEM replacement selections for R/R you did not read GS Stator also in my signature.
The only big mysteries are what you did not how the system works.
 
Yes, do the Quick Test. Also, rewire the charging system so the stator feeds directly into the R/R, otherwise your harness could melt down.
 
Nessism said:
Yes, do the Quick Test. Also, rewire the charging system so the stator feeds directly into the R/R, otherwise your harness could melt down.
Click to expand...


Yea that is in GS Charging Health is my signature as well. Did not want to overload the Op :)
 
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