My son had the same problem in same vehicle (but with the Plymouth badge).
There is a fuse, located in the larger fuse block out under the hood on the
driver's side (a.k.a. "power distribution center" or some such) labeled
"accessory", and, I believe, 10 amp. (It's one of those "mini" fuses, and
almost impossible to see the blown wire.) Of course, replacing it didn't
help much, as it blew again (from powering even a portable CD player let
alone a small air pump), even when we tried plugging in a 15 amp fuse. There
was a thread a while back about this problem. One of the ideas was that if
any of the wires in that circuit have frayed, effectively reducing the gauge
(and therefore the current carrying capacity), it would cause it to draw
harder, thereby blowing fuses.