The lamp cord wasn't screwed down, but it made a good connection. The wire should not have heated up that much in just a few seconds. The fan should draw no more than 360W of power.

I do have an ammeter.

Something caused the fuse to melt and it was quite hot for a long time because of the hole melted in the bottom of the plastic fuse box. The fuse probably was not corroded. The car is a garage queen.

I looked at the fan motor again this morning. It is not turning freely enough, although it is not seized.

Another motor and fuse are on the way. Parts Geek - $82

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1991 350SD (updated rods)
Biodiesel B100 when I can find it.
Dino when really cold outside