Where is the asd relay on a 1994 dodge b250 van?

There isn't a standard "ASD relay" in the way that term is used on some other vehicles (like some Chrysler products) on a 1994 Dodge B250. The B250's fuel pump and other power circuits are controlled differently. Instead of a single ASD relay, the functions are spread across multiple relays and the Power Distribution Center (PDC).

To find the relays controlling the fuel pump and other ignition-related circuits, you'll need to consult a wiring diagram specific to your 1994 Dodge B250's engine and options. The location of the PDC itself is usually under the hood, often near the battery. The diagram will show you which relay(s) control what circuits and where those relays are located within the PDC.

You can find wiring diagrams online through sites specializing in automotive repair information (like those offering repair manuals) or at a local auto parts store. Providing your engine size (e.g., 3.9L, 5.2L, 5.9L) will help narrow down the search for the correct diagram.