2001 Ford Ranger Electrical problem

My ranger has 106,500 miles with a 3.0 L V-6. After ford disconnected my cruise control for the recall which they are suppose to fix later when they get the parts. The ABS light has been coming on, I had the airbag light come on and stay on once until I shut the vehicle off, I am now also getting the speedometer bouncing from 10 to 30 miles in park or when I am sitting at a stop light and the last thing was the ABS light started flashing instead of being steady and the radio was going off and coming on ( the display would go blank) with the flashing of the ABS light. It also took 3 tries of the ignition switch to get it to start once. The battery shows 12V and has 13.5V when the engine is running. Although the battery is still the factory battery. I can't find any elstrical diaghrams of the wiring for the radio or the ABS system. Any ideas on what I can look for or check?