Don't know about return policy. You'll have to call. If it's the wrong part, they should replace it. They sell that item here for about $27.00. It sounds like it's the wrong part, but.. try and connect it, may be just a different aftermarket mfg.
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.