To find it, you'll likely need to:
1. Consult your owner's manual: This is the best place to start. It should have a diagram showing the location of the flasher relay.
2. Look at a wiring diagram: A wiring diagram specific to your 1991 Dodge Spirit will precisely show the flasher relay's location. You can usually find these online through repair manual sites or forums dedicated to Dodge vehicles.
3. Carefully examine the under-dash area: Remove the lower dash panel (if necessary) to gain better access to the fuse panel and any relay centers behind it. The flasher relay is often a small, square or rectangular component with multiple wires connected.
4. Check online forums: Search forums dedicated to Dodge Spirits (or Chrysler/Plymouth vehicles of that era, as they often shared components). Other owners may have posted about locating their flasher relay.
Because it's not in the common locations you've already checked, a visual inspection and consulting resources like a wiring diagram are essential to pinpoint its exact location in your specific vehicle. Remember to disconnect the negative battery terminal before working with any electrical components.