Probably a bad key switch, the starter needs voltage from the switch to the solenoid to engage so start there.
You might also want to look at the starter, sometimes something can get lodged down there and bridge the connection.
The starter is on the side of the engine at the bottom.
the solenoid on that year ford starter is on top of the starter itself. that starter is used on a wide variety of ford products.
either the starter is worn out and needs rebuilding, or the battery is bad
On a 2006 Ford E350, the starter is located on the driver's side of the engine, near the bottom of the engine block. It is positioned between the engine and the transmission, making it accessible from underneath the vehicle. To replace or service the starter, you may need to raise the vehicle for better access. Always ensure to disconnect the battery before working on the starter.
The starter relay on a 2009 Ford E350 is located in the engine compartment, specifically in the power distribution box. This box is situated near the driver's side fender. You can identify the starter relay by checking the diagram on the cover of the power distribution box, which will indicate the specific location of the relay.
could be right in front of the battery - that's where it is on my 89
Most commonly, it's the starter or the starter was wired wrong when it was installed. More rarely, it can also be the keyswitch or even a bad gear on the flex-plate.
The starter relay on a 1999 Ford E350 V10 van is typically located in the engine compartment's fuse box. You can find the fuse box near the driver's side, close to the battery. The starter relay is often labeled in the fuse box cover, making it easier to identify. If you need to replace it, ensure you disconnect the battery first for safety.
it is located under the engine on the right side of the engine. crawl under the right front wheel and you will see the starter motor and the associated wiring.
The engine has to be removed.
the starter motor on just about any engine is very close to the crankshaft. the easiest way to find it is to follow the wires of the ignition system (usually yellow, sometimes black, it depends) the ignition system is directly connected to the starter.
The starter relay on a 2003 Ford E350 is typically located in the engine compartment's fuse box, which is found near the battery. Look for a rectangular black relay in the fuse box; it should be labeled for easy identification. If you're having trouble locating it, refer to the vehicle's owner's manual for a detailed diagram.