Davidmc

I have a 1996 Mack RD600. The other day I would turn the key and have full power, the truck would start and everything on the dash would work. Now all my gauges are frozen, my Jake brake won’t turn on, my ac won’t work and my strobe light switch is on the dash and that won’t work either. All the lights inside and outside do work though. I’ve shut the truck on and off and sometimes everything works. Any ideas?