12V mystery
Here's one I cannot figure out. I have two AGM group 31 battery's that are about four years old. They stay plugged in when at home and I have a 2020 Trimetric monitor which I monitor often whether on ...
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I had an odd occurrence one time. I was driving several hours at night. It was cold outside, raining hard, fogging and cold inside the truck. I had the headlights on, AC defrost on, Fan on high, All the running lights blaring. I had a full battery when I started and ended up with 2 AGM group 31's at 12.2 volts. I'm guessing my alternator could not meet the demand. I have a new alternator now and have not had the problem happen since.
Just another point. If you have 2 AGM batteries rated at 12.8 volts in the TC and a regular lead acid battery rated at 12.6 volts in the truck. It is possible that the AGM's may be fooling your voltage regulator with the different voltage rated batteries. I have all AGM batteries in the TC and the truck, trying to better match the whole electrical system for 12.8 volts.
Just another point. If you have 2 AGM batteries rated at 12.8 volts in the TC and a regular lead acid battery rated at 12.6 volts in the truck. It is possible that the AGM's may be fooling your voltage regulator with the different voltage rated batteries. I have all AGM batteries in the TC and the truck, trying to better match the whole electrical system for 12.8 volts.
