To find it, you'll need to do some detective work:
1. Consult your owner's manual: This is the first place to check. While it might not pinpoint the relay precisely, it may have a diagram of the fuse box(es) and relay locations, or at least point you to the correct fuse box related to the rear defroster.
2. Check both fuse boxes: 1996 Grand Caravans typically have at least two fuse boxes – one under the hood and one inside the vehicle, usually under the dashboard on the driver's side. Carefully examine both, looking for a relay labeled "rear defroster," "rear window defogger," or a similar designation. If you see several unmarked relays, you may need to refer to a wiring diagram.
3. Use a wiring diagram: A wiring diagram specific to your year, make, model, and options will show the relay's location and its connection to the rear defroster circuit. You can usually find these diagrams in a repair manual (like a Haynes or Chilton manual) or sometimes online through forums dedicated to Dodge Grand Caravans. Beware, though, that diagrams can be complex.
4. Trace the wiring: As a last resort, if you can't find the relay based on the above, trace the wiring from the rear defroster switch back towards the fuse boxes. Follow the wire carefully to see where it connects to a relay. Be cautious when working with car wiring. Disconnect the battery negative terminal before attempting this to avoid short circuits.
Without a specific trim level and further details of your van, I can't provide a more precise location. The process of finding the relay involves methodical checking and potentially using additional resources.
