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My mechanic is correcting a lot of jerry-rigged wiring jobs on my 1981 f250
It had two owners before me
He said the wiring went from the harness, to a relay and from the relay to this light blue guy
We are pretty sure that the wiring goes from this to the a/c compressor but he has no idea what this is and it isn’t showing up on the Haynes manual
We are thinking that this truck had after market a/c installed somewhere along the way. The compressor itself is fried at this point and looks old but the wiring job and the lines definitely aren’t factory
