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jkv45 · September 10th, 2015, 01:41 PM

If you have a volt meter, I would read the battery before trying to start it - it should be 12.7V or above if it's fully charged. Then read it as you turn on the key. It should still read 12.5 or so. If that checks out, read it as you are hitting the starter button. You should see over 11V as it's cranking. If at any time it drops below 11V it's toast - even if it read 12.7 V before putting a load on it.

A battery can show fully charged (green light) but drop off to nothing when under any amount of load.

I'm thinking that's what's going on.

Other things to check would be all of the connections to and from the battery and where any grounds attach to the frame.

September 10th, 2015, 01:41 PM	#10
jkv45 Rev Limiter Name: Jay Location: WI Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot. MOTM - Jun '18, Oct '16	If you have a volt meter, I would read the battery before trying to start it - it should be 12.7V or above if it's fully charged. Then read it as you turn on the key. It should still read 12.5 or so. If that checks out, read it as you are hitting the starter button. You should see over 11V as it's cranking. If at any time it drops below 11V it's toast - even if it read 12.7 V before putting a load on it. A battery can show fully charged (green light) but drop off to nothing when under any amount of load. I'm thinking that's what's going on. Other things to check would be all of the connections to and from the battery and where any grounds attach to the frame.