Thetford AC/DC frig question

[JoeofNSB]

I have a Thetford MRFT-630C portable AC/DC frig and don't have a 12 volt cord for it. Seems to be a discontinued part in all my searches. It has
three (3), yes three wires to feed 12 volts DC and I'm wondering if someone has a cord that they can tell me which plugs / terminals are which?
Wire and terminals look like this:

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........ |
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Not sure if the 2 horizontal wires/terminals are both positive, both negative or what. Any help would be greatly appreciated.

[Bob Landry]

Norcold's dual voltage units are standard AC & 12VDC. The plug you are looking at with three prongs/connectors is going to be the AC plug. DC plug is going to be only 2 wires, 12V+ and ground. If you can't find the cord, PM me and I'll check with my distributor to see if they are still available. I'm a Norcold dealer. Power cords shouldn't be very expensive if they are still available and I havn't received any bulletins about that box being discontinued.

[JoeofNSB]

Please see the attached photos as they are both three prong. Thanks.