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Original post by: MrJimPhelps ,

Text:

You may have a bad ignition switch — not the part that you put the key into, but the electronic module behind the key switch.

I had a Mercury Grand Marquis once, and sometimes the radio would go on and off and on and off and on and off…  A coworker asked his brother, a Ford Mechanic, what it could be, and he told him the ignition switch.  I bought a new one at Auto Zone for $15 and installed it, and the problem was solved.  It was an easy install; and the old one had a smoky smell, as if it had been burning.

Durum:

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