I've just replaced the stator and regulator on my 1981 GS450. The output voltage is a constant 14.8V from idling to 4000 rpm. With the headlight switched on, the voltage decreases to about 13.3V at idling going up to 14.5V at 4000 rpm. Is this normal? I always ride with the headlight on but I'm still worried that the battery will be overcharged. Thanks for any help.
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Charging Voltage
- Thread starter ssco156
- Start date
Well, your stator is strong. Did you install an SH775 R/R to protect it? And did you rewire the charging system to avoid the stator loop wiring through the hand control and improve the R/R grounding? The 450 grounds the R/R through the battery box which is a horrable method. High charging voltage on the 450 is known to take out ignitors so you have to pay attention to how the system is working.
OP has not said what he has done to the charging system so we will have to assume it is stock. My 1981 GS750E had a single leg (SCR) regulator which I think are the ones that tend to overcharge (because they only regulate on one leg).
Since the reported voltage with lights off/on is 14.8v/14.5v respectively, that would indicate that the stator is potentially reaching max power output with a headlamp on. It could be that the stator is slightly burned (reduced output) which is why the voltage only achieves 14.5V with headlamps on.
Could be a combination of factors, burned stator, over-charging single leg R/R and probably poor grounds and connections although I don't know how this would contribute to overcharging.
Basically we are probably just looking at a well worn 40 year old flawed charging system.
Since the reported voltage with lights off/on is 14.8v/14.5v respectively, that would indicate that the stator is potentially reaching max power output with a headlamp on. It could be that the stator is slightly burned (reduced output) which is why the voltage only achieves 14.5V with headlamps on.
Could be a combination of factors, burned stator, over-charging single leg R/R and probably poor grounds and connections although I don't know how this would contribute to overcharging.
Basically we are probably just looking at a well worn 40 year old flawed charging system.
