I have been having a battery problems with my 2006 599 on and off for a year, after the dealer said all was ok with my bike and two batteries later. I took matters into my own hands. In short:

1. Your charge rate should be 13.5+ volts DC at 2,500 rpm
2. Your charge rate should be 14.8 volts DC at 5,000 rpm
3. If not check your alternator, by disconnecting the alternator plug (3 yellow wires) and by using AC setting on multi meter go yellow to yellow to yellow on all three wires that should read 50 volts AC at 5,000 rpm. (no plus or minus on AC current) ….DO NOT CROSS OR GROUND THE WIRES…..If alternator is ok then it is a faulty rectifier / regulator (RR) or could be a short in the wiring.
4. BUT before you buy any new parts, complete check that I found on the Internet.

Go to the bottom of this page and download the PDF file and print.
http://www.electrosport.com/electrosport_fault_finding.html

I ordered a new rectifier / regulator because after doing all of the above checks showed that part to be the problem. Wish me luck. Cheapest prices with complete factory parts manual diagrams: http://www.motogrid.com/

Sneaky should do a video on this HINT HINT
GOOD LUCK.

:lol: You said rectifier!