Someone on here ran a circuit that could be built and installed accross house batteries that was visible from outside the rig to monitor the batter charge levels. Does anyone still have it?
I use a four (4) place voltmeter sticky-taped onto the dash of my Class C.
Since this meter measures to 1/100 of a volt, it exactly tells you when your batteries are, say, up past 12.7V - unlike the usual three (3) place 1/10 volt meters where you're not sure where your battery is within the entire range of 12.65V to 12.75V when the 1/10 volt meter reads "12.7V" .... a big difference in battery state of charge between 12.65V and 12.75V.
I just look in the cab window of my rig anytime to see what this meter is reading.
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