I am working on a 1989 Ford F700. I believe that the solenoid is bad on it.
Looking around for wiring diagrams, most of them show battery and starter connections to the solenoid opposite of what I have on the truck.
Does it matter which of the big posts the battery and the starter connect to?
How is the “I” terminal connected internally inside the solenoid? I would not want to supply constant 12V to the ignition coil. At least one diagram on the web (https://i2.wp.com/www.disconnecteddocumentary.com/wp-content/uploads/2016/11/start-typical-stock-system-ford-solenoid-wiring-diagram-direct-drive-key-red-black-most-neautral.jpg) shows the “I” terminal bonded to one of the big posts, which would make the big posts non-interchangeable. But I hope that the diagram is wrong.