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The radio in my 86 just went one day when I fired the truck up I turned the radio on and completely static on all channels. I checked the antenna and it is good.
Dustin
I would yank the head unit out, and try temporarily attaching a different antenna, that is, if you have enuf wire to operate the radio while it is hanging out of the dash. It must be a bad antenna or the circuitry inside the radio is bad.
The antenna mount is grounded, but a working antenna temporarily plugged into the back of the radio and held in your hand will give you enuf signal to check your reception.
Checking the antenna is the first step, two reasons: The antenna is cheap, even at Ford dealer prices, less than 50 dollars, also it is easier and cheaper to replace than the head unit