The battery is a Deca ETX20L installed a year ago and goes on the tender when it sits for longer periods. When I start her up (whether it sat on the tender or not) I sometimes get flashing lights in the tach while idling. Once I snap the throttle the flashing stops and everything goes back to normal. Do I have a weak stator, bad connections, or a bad battery?
If battery, what is the battery to buy now?
If stator, what is the stator to buy now?
If bad connections, where is it most likely to be?

If battery, what is the battery to buy now?
If stator, what is the stator to buy now?
If bad connections, where is it most likely to be?