I’ll start out asking if anyone knows what the draw on the battery might be from the carb heaters. My issue is charging voltage as the temperature was around 45 degrees and checked the output voltage was down to 12.8. Did the normal test thought maybe had a problem with rectifier but not so. Further test was trying to figure out what was wrong all the wiring and connections are clean and tight. Digging into it further pulling fuses one at a time I started with light fuses then the voltage went to 13.1 still not what I expected. Went further and pulled the carb heater fuse and what do I have now The voltage came up to 14.3 I can live with that. Why concerns are do the heaters run all the time or do they turn off like being timed or are the temp controlled. Any one have issues with the 650 charging system keeping battery charge. This didn’t happen when warmer weather was here.