2002 Dodge Caravan Power to radio and heater and AC blower

Hi there,

Car radio power comes on for a second and then goes off, when the fan is on for either AC/ or heat it does the same thing, Electric windows are also start stop when using. Their are brief times when everything is okay for a extended period of time and then it starts up again. I know this sounds like a short but I dont even know where to start to look? And if this is a fuse problem why would it affect the radio, blower and windows since they are all on diffrent fuses? Everyhting else seems to be working fine, signals, wipers, power locks etc. Please HELP.