Where is the starter relay on a 1999 ford e350 v10 van?

The starter relay for a 1999 Ford E350 V10 van is located in the engine compartment, on the passenger side of the vehicle, near the battery. It is a small, black box with two large electrical terminals and two smaller ones. The larger terminals are connected to the battery and the starter motor, while the smaller terminals are connected to the ignition switch and the vehicle's electrical system.