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post #11 of 11 (permalink) Old 07-20-2017, 11:11 PM
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I drive often at night and bear in mind that I have replaced every last bulb in my Fortwo with LED's and in many cases have added extra LED's when the running lights are on. But it is common for me to drive at night with HID headlights on, the radio is always on and running the A/C which also switches on the radiator fan to run continuous. At idle my voltage never drops below 13.2. The digital voltage gauge I added to my fortwo samples voltage once per second and it is not uncommon to see the voltage fluctuate about .5 (half) a volt. So normally I am running 14.2 to 14.3 during daytime driving, no lights, A/C or not and always the radio. During the time it is 14.2 or 14.3 it occasionally reads 13.8 or 13.9, but most of the sampling times it is on 14.2. I'm sure the fluctuation is from the voltage regulator working at maintaining a full charge on the battery. My feed wire for my voltage gauge is from one of the accessory terminals on the fuse box. The 12.3 you are seeing is perfectly acceptable if the ignition is turned on but the engine isn't running. There have been so many cases of quirks in the electronics and they ended up being a weak battery as proven time and time again here on the forum. I think I would dig out your reliable multimeter and take some voltage readings in the system and logically look at it to determine where your problem actually is. There is already some great advice on this thread already, and they are giving great advice too. DCO
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