Not sure what make of tractor you have, but most sleeper power supplies have a GFCI. On the Freightliners they are inside the side luggage box. Press test then reset. You may have to do this every time you turn the batteries back on. Hope this helps.
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I’m trying to charge my MSI Katana laptop, the truck I drives has a 2000w power inverter in it but every-time I plug my laptop into it the power box on the charger makes a faint buzzing noise and will not charge my laptop. I’m not too sure how to get it to charge, I tried research and everyone else seems to charge their laptops fine and play games, just wondering if I’m missing something. Thanks in advanced. (I will mainly use the laptop to watch tv and occasionally play games)