* Under the hood, in the Power Distribution Center (PDC): This is the most likely location. The PDC is usually a large black plastic box located near the battery, often on the driver's side fender well. The relays are usually either in sockets that you can easily remove or are mounted directly to the PDC. You'll need to consult your owner's manual or a wiring diagram to identify the specific relay for the headlights. The diagram should show the relay's location within the PDC.
* Inside the cab, under the dashboard: This is less common, but possible on some configurations. If it's here, accessing it will require removing some trim panels.
To find it:
1. Consult your owner's manual: This is the best place to start. It should have a diagram showing the location of all the fuses and relays.
2. Look in the Power Distribution Center (PDC): This is the most likely location. Open the hood and locate the PDC. Examine the relays and compare them to the diagram in your owner's manual.
3. Use a wiring diagram: If you can't find it using the owner's manual, a wiring diagram specific to your 1996 Dodge Ram 1500 is invaluable. These can sometimes be found online (though accuracy isn't guaranteed) or at an auto parts store.
Important Note: Before working on any electrical components, disconnect the negative terminal of your battery to prevent accidental short circuits.
