1996 Mercury Sable Repair Question
The power steering is not related to electrical problems, but all of your symptoms could be caused by a slipping serpentine belt. That will cause the power steering pump to slow down and the generator will not keep up with demand so the battery will start to run down. Signals, the radio, and anything controlled by a computer will be affected by low voltage.
Start by using an inexpensive digital voltmeter to measure the battery voltage while the engine is running and the problem is acting up. It must be between 13.75 and 14.75 volts. If it is low, check the belt to be sure it's tight. You might also be able to see the power steering pump pulley slow down while the engine is running and a helper turns the steering wheel.
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