Started my rig, 93 HDJ81 and majority of my warning lights came on. Everything sounded OK, at idle, and up to 2000rpm while in park. Fluids check ok. My voltage is reading a bit low on digital dash gauge I have, reading 11 volts and didn't fluctuate up when I revved the engine up to 2000 rpm. I haven't started further diagnostics yet. Any diagnostic help is appreciated, thank you.