If you got missed that plug, it can be made with any DIN 7 female plug around and sold the plug terminals with jumper wires inside
You can even make a Plug adaptor with a DIN female plug, a piece of 4 conductors wire and a NC 1/8" stereo jack which will allow to insert any input source into the Radio. I in fact made an adaptor ( but included also a 12 volts source using a Cigar ligher socket spliced into the same DIN plug pigtail which provides power too )
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or
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It sound like you are saying that you have one of those factory "bridging plugs" that were used when the cassette deck is not there, and that pins 1 and 3 are jumped and also pins 4 and 5 are jumped.Looking at a bridging plug with a magnifier [old eyes] pins 1o-3i L/channel & 4o-5i R/channel.
o=out/i=in
If you look at diagram will find what pins to jump out into the female DIN plug to get in and outs linked to make the radio work without the factory jumper plug.
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need to say, the diagram shows in and out from the cassette player point of view... so the input is input to cassette player unit and output is output FROM cassette player. This is because the cassette player gets the audio selector switch ( Radio or cassette ) into the unit
Or as mentioned, make the adaptor to be able to get a line in insert using the 1/8 NC stereo jack. These will keep the radio signal linked to the radio untill you get in an insert line. Just like when on your home portable stereo insert a headphone and cut the speakers signal, but this time cutting the line in instead the signal out.
You can get it here:Thanks for the info, is this from a service book or manual? how can I get one?
Thanks Rockland!You can get it here:
https://mymopar.com/service-manuals/
Make a separate post in the interior for sale section. Must have picture too to post.If anyone revisits this post, I have a cassette for sale. $125 plus shipping.