I have an 03 F250, 7.3 liter, long bed, super cab, 4wd power stroke. Love it, but something is going crazy in the dash....! Please help if you know these odd symptoms.

In the summer months, windows up and truck parked, inside temp is high. On start up, the radio display is blank, no clock displayed or radio and the power windows do not work. Drive 1 to 3, 1/10nths a mile or smack the top of the dash and the radio comes on and the windows work. Also;

The reverse back up alarm button should always default in the ON position, with (OFF) light off on start up, but mine may or may not be on regardless of temperature. It does what it wants to.

The Air Bag light flashes a code. It flashes 2 times and then 7, a few times before it stays lit for the remainder of trip. Or not. It may not do this at all if it wishes.

Just this week, the fuel gage was fine, then dropped to nothing with the gas pump light on, during a drive. I was not empty. I cycled the key once I parked and the gage was fine. Today, cycling the key did not work, but the gage did come back on by itself.

There must be a bad ground somewhere or something... Please tell me where to look if you know what the heck this is.

Thanks,
Dano