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The plug you need for the Chescold 12 Volt Lead should be a Britax B62A or equiv (you want the flush mount not the inline)

$18 or so...

That is a very old Chescold... sure says something for the quality when it is still working theses days.

Chesco, Electrolux and early Dometic were all the same/similar IIRC if you do need parts.
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The internal fan is not temp dependant and is switched via a lid micro and doesn't run with the lid open.

Opposite way around but you can test it the same way as you test to see if your house...

Darn good find for $0 bucks mate.

You've pretty much nailed it on how to use them.
If you treat it as an Esky that uses Power instead of Ice to keep things cold then you should be happy.

As...

We have two at work that are used on small boats as 'lunch boxes' for drinks, crib and lunch tucker.

I haven't used them personally so not sure how helpful the following is but...
The crews (2...