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bkh2 · February 19th, 2012, 04:22 PM

So after sitting for a few days, my bike won't start and I'm pretty sure it's just a dead battery. I read the Ninja Wiki page and it provides a checklist for voltages. Just for the sake of peace of mind, I went ahead and checked all of them before buying a new battery:

Sitting Voltage: 12.2V min, 12.6-12.8V ideal -- Mine: 12.1V
Voltage when cranking: 10V -- Mine: 6.4V
Idle Voltage should equal same as sitting voltage -- Mine: 14.1V
4k RPM Voltage: 13.5-13.8V -- Mine: 13.5V

It also asks to check 10-15 mile off-voltage and voltage after a couple days of sitting: 12.8V and 12.6V respectively.

My question is why my idle voltage is so much higher than the sitting voltage (when bike is completely off). Is this not normal, and if so, would that mean my regulator is malfunctioning?

On a side note, my idle voltage is 14.1V and when I rev, the voltage drops. I thought the alternator produces more power at higher RPMs which is somewhat counterintuitive as to why my voltage drops when revving. In the ideal case, idle should be ~12.7V and 4k-9k RPM should be 13.5-13.8V, according to the wiki. This means that voltage should increase as RPM's increase. Why is mine backwards?

February 19th, 2012, 04:22 PM	#1
bkh2 ninjette.org guru Name: Ben Location: R'lyeh Join Date: May 2011 Motorcycle(s): 2006 GSXR 750; 1983 CB750SC Posts: 277	Troubleshooting Battery/Alternator Help So after sitting for a few days, my bike won't start and I'm pretty sure it's just a dead battery. I read the Ninja Wiki page and it provides a checklist for voltages. Just for the sake of peace of mind, I went ahead and checked all of them before buying a new battery: Sitting Voltage: 12.2V min, 12.6-12.8V ideal -- Mine: 12.1V Voltage when cranking: 10V -- Mine: 6.4V Idle Voltage should equal same as sitting voltage -- Mine: 14.1V 4k RPM Voltage: 13.5-13.8V -- Mine: 13.5V It also asks to check 10-15 mile off-voltage and voltage after a couple days of sitting: 12.8V and 12.6V respectively. My question is why my idle voltage is so much higher than the sitting voltage (when bike is completely off). Is this not normal, and if so, would that mean my regulator is malfunctioning? On a side note, my idle voltage is 14.1V and when I rev, the voltage drops. I thought the alternator produces more power at higher RPMs which is somewhat counterintuitive as to why my voltage drops when revving. In the ideal case, idle should be ~12.7V and 4k-9k RPM should be 13.5-13.8V, according to the wiki. This means that voltage should increase as RPM's increase. Why is mine backwards?