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This is my top left dash on 23 t680. Normally the percentage isnt there and I have a percentage on the aux (electric apu). The shop just changed a sensor and it looks like the above pic and my apu doesn't show a battery. So I would assume it's not getting a charge since the ecm doesn't see it. However that percentage that just showed up isn't going down like it should. With the truck off and a coolor and freezer running for 10 hrs it still showed 86%. Drove 20 miles and cooked dinner and it still shows 88% even with the truck off and using the microwave. The low voltage came on, so I'd expect it to read at minimum 50 or lower. Those that have the percentage without an aux set, what does yours read when the low voltage protection kick on?
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