To be certain, you should:
* Consult your owner's manual: This is the best resource for the precise location in your specific vehicle.
* Look for a small, usually red, button or switch: It might be labeled "Inertia Switch" or have a similar marking.
* Check online forums: Searching for "2000 Dodge Ram 2500 inertia switch location" on forums dedicated to Dodge Ram trucks might yield pictures from other owners showing its position.
It's a small component, so be sure to look carefully in the area under the dash.