I have a 2003 Yamaha FZS600 that lately started to drain the battery while it's not in use for 2-3 days. I bought the battery in this year's February and if I charge it it does its job. Yesterday I wasn't able to start the motorcycle normally again so I jumpstarted it (works & goes perfectly that way). After a few miles I noticed that instruments are going off and on again. The headlight stays on, engine runs perfectly though. When I hit the PASS light or switch on and off the headlights it does that almost everytime too. Any ideas where to start checking things?
Wiring harness, pull the tank and disconnect the main harness connection, visually inspection and contact cleaner might help. Sounds like you have a failing connection from battery to fuse block, the increased power draw when you energize the lights is an indication of improper current flow.
Thanks for the tips! I ended up at my mechanic and turned out the generator regulator was faulty. There was no charge on my battery so it drained totally, I had to replace that too. But finally with my new regulator and battery, everything just works fine.