* Under the hood: Many relays are located in fuse boxes under the hood. There might be one or more fuse/relay boxes. Check the diagrams in your owner's manual to identify the specific location for the relay you need.
* Inside the cab: Some relays might be located inside the cab, often near the fuse panel under the dashboard. Again, consult your owner's manual.
* Integrated into other modules: In some cases, relays might be integrated into larger modules and not easily accessible as individual components.
To find the specific relay you need:
1. Consult your owner's manual: This is the best resource. It should have a diagram showing the locations of all fuses and relays, and often provides a legend to identify which relay controls what.
2. Look for diagrams online: If you don't have the owner's manual, search online for "2000 E350 van fuse box diagram" or "2000 E350 van relay locations." You'll find various diagrams; make sure it matches your exact van model (there were several configurations).
3. Check the relay itself: If you know which relay you're looking for (e.g., the headlight relay), it often has its function printed on it. This can help you narrow down the search area.
Without knowing *which* relay you're searching for, it's impossible to give a more precise location.