Volvo sleeper having some electrical issue. New batteries as of January, truck drops from 14.4V to 10.1V when I shut the engine off...the buzzer in the sleeper beeps after 5 minutes so I press the "fan-down" button to shut off the sleeper blower.
I'd use Idle Smart to periodically restart the engine to recharge the battery but I feel like 10.1V is too low of a threshold...therefore if I were to use Idle Smart the truck would just be on 24/7 to keep battery not at 10.1V. And besides, Idle Smart shuts off anyway after 5min because of engine idle shutdown so I don't even use it.
Bunk heater and fridge malfunction too; they'll work for a limited time before powering down when the truck is off. And when it was working fine the bunk heater got it too hot on the coldest setting...when I had the circle knob at coldest setting in the sleeper the bunk heater got to 75-80⁰F...I sleep at 60⁰F. But, winter is almost over and I'm having to use the A/C to keep at 60⁰F while I sleep...but even the A/C is struggling to keep it cool inside...if it's 80⁰F (like it was in LA/TX last week) it struggles to keep interior cool)...in order to keep A/C on I just push in yellow knob and leave truck running. I let the trailer brakes hold me in place.
The 2000w power inverter will run for 20 seconds before the orange light on it starts flashing and it shuts off...even when the engine is on the inverter shuts off after 20 seconds of microwaving food with a 900w microwave.
Plus, when I'm driving every so often the dashboard lights up every minute with "Light Controle Module in High Voltage Mode" and after a split second that warning disappears.
What could it all be?
Electrical Problem
Discussion in 'Questions From New Drivers' started by PianoManCJS, Mar 4, 2026 at 6:39 PM.
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