Where is the starter solenoid on an e250 cargo van

It should be on the starter. The old school Ford's were externally mounted usually on the inner fenderwell.

Nb

I've been messing with my no crank no start on my 03 E250 when is far as changing starter and solenoid troubleshooted every wire or relay could find that has to do with the ignition still no crank no start once in a while I slam the hood and it starts pain in the butt Ford dealership had it today technician found II starter solenoid first one of course on the starter second one mounted really low on the firewall unbelievable two solenoids

it is mounted on the wall inside right next to the battery! just follow the wires and look on google for your car model solenoid part to see exactly how it looks!