Originally Posted by mfrederick
It is a big square box and looks like it connects to frame somewhere. It came with an aluminum ground lead so it does not go in fuse box. Very frustrated.
The relay that you linked to in your first post (MT0506) does not have any ground lead attached and belongs in the fusebox under the hood, it's a universal relay that is used for several parts...cooling fan, heater/ac blower, headlights etc.
Being AutoZone I'd suggest they gave you the wrong part.
Knowing the code that was thrown or symptom of what the vehicle is doing could help figure it out.