Number of things to check. First, the fuse, located outside the fuse box forward of the firewall bulkhead, near the edge of the fender (on the driver's side) in a little black plastic holder with a wire exiting from each end. Pop this open and check the fuse. Use a test light to see if you have 12 volts on either side of the fuse. If that's OK, call back here and we can dig a little more. It sounds more like brushes than anything else. What's the mileage??
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.