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1957 Ford car radio installation.

I need to identify speaker wires from hot and ground wires for a 1957 FoMoCo 12 volt radio [ Not installed.] There are two black wires on the left side of the case. One is soldered to a copper plate on the case, which also has a bare copper wire going to a copper coil.. The other goes to separate copper plate on the case, along with a wire to the on-off switch. These both appear to be grounded to the case.
In the back of the case is a fibre plate with two small holes for a plug-wire. The smaller [[green] wire goes to a larger copper coil which also goes to ground.. The larger hole goes to a ground on the case via a black wire.

I appreciate any help as I do not wish to blow anything out.

Thanks, Ray Latimer

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  • Rayla Jun 23, 2008

    This is actually an original 1957 Ford radio that I just want to ckeck out before selling it on e-bay. I did check out the grounds from the 12 volt. The only two of the four connections that do not go to ground are the two black wires on the side. Is the one to the off-on switch the 12 v? Where does the other go? Are the two holes on the back to a speaker, or two? Does anyone have a diagram?

    Thanks for any help. Ray

  • Rayla Jun 24, 2008

    To zapco: No, I am not trying to install a new radio.. This is an original stock FoMoCo radio, pushbutton AM, that I just need to check if it works so I can sell it on ebay. I have since checked the wires with a test light, and the two black wires to the switch and to the coil are not grounded to the case, as they appeared to be.

    I was hoping someone would havaa wiring diagram so I can also get the positive and negative wires differentiated.

    If I can figure out how, I will attach two pics I took of the radio. Thanks for your help. Rayla.

  • james  boyone
    james boyone May 11, 2010

    hi need more info ...from what i think u r trying todo is install a new radio or somthing else?..for one thing u will need a 12v test get a true ground..and true 12v....if u are also trying to get speaker info u may have to right from the speaker themself...for the right color..-/+.



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There are actually 4 wires on the right side 2 are speaker wires and the other 2 are the positive and negative connections . the black wire is positive supply and the green/red wire is negative earth . strange wiring !!

Posted on Sep 12, 2008


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