Since its leaking red fluid, I'm going to say for sure that it is the auto tranny cooler, especially since this truck doesn't have a/c. But it did have the cutest little intercooler...
Anyway, I walked away from the sale, the owner had tried to charge the batteries, but he reversed the polarity when he did so, and now, some of the accessories work, but nothing lights up when the key is inserted in the ignition and nothing happens when you turn the key
I checked the fuses, verified 12v to the solonoid, had no joy, and walked away.
What a waste, that truck will probably end up in the scrapyard.