2005 K12S Battery Issue..
Hey Folks, first time caller long time listener,
In October of 2016 i had an battery issue with this bike: Drove 800 miles over 2 days, day 3 red battery light comes on and bike starts. End of day 3 after sitting for 2 hours, ignition on, LCD turns on, go to crank -> dead. Bike needs boost to get started, runs normal for 160 miles until out of gas, get to gas station, turn off, fill up, battery dead.
Nov 2016 - New battery installed. BMW OEM AGM. Bike runs great. Problem goes away. No issues noted.
March 2017 - Left the bike outside for 5 days without running it. Key in ingnition, turn key, nothing. Battery dead. Got a boost, bike runs normally. let it run for 5 minutes. Left it cold for 10. Came back, turn key, nothing. Battery dead.
Maybe unrelated: 5 days before this issue occured, gas gauge went from 3/4 full to 20 miles left to 0 miles left in about a 30 second time frame after running for 15 mins. Gas gauge level no longer works on the computer (shows 0 miles).
Another maybe unrelated: An ignition coil went bad on me (cyl 3) in Jan after sitting for 2 weeks (???). A pain to fix - but after fix and new coil - issue went away. Ran normal for 4 weeks until this battery issue came back.
Any suggestions? ABS Relay drawing power? How come it worked fine with new battery for 2 months? I would have expected problem to come back right away if it was something like my stator.