Question about 1990 Ford F250

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Ford code reader won't fit test plugs on my 1990 F250

I need to know which terminal is which, so I can read the codes with my multimeter.

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  • geoelbell Dec 31, 2008

    Got a Ford code reader- it won't fit the plug. This plug is square, and none of the terminal blades will mate to it! My code reader manual has a listing of all vehicles that the reader works on. My F250 isn't one of them! Just my luck!! I could use my multimeter if I knew which terminal was which!

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Under dash by steering column past the plastic that covers lower dash and get a code reader .

Posted on Dec 31, 2008

  • john vecchione Dec 31, 2008

    obd 2 code reader should have an adapter to fit the square plugs. contact mac tools , cornwell snapon or try dianostics on internet theres got to be a reader that fits.ask auto zone for a diagram of your plug mabey some aftermarket books at the library , look under reference books and auto troubleshooting dianostics.

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