Got a 2019 Peterbilt 579 with a Xantrex Freedom HF inverter that won’t turn on. I had it running a few days ago with no problems. I pushed the power button on the led readout selector and nothing happens. I don’t know if it’s a fuse or what, I don’t have those tester leads to poke around fuses to see what works and what doesn’t. Any help is appreciated, thanks.