I'd check your fuses which I'm sure you've done & pull the connector off of the wiper switch behind the dash & see if it has fire to it (when the ign sw is switched "on") & pull apart the black bulkhead connectors on the firewall & check/clean the brass terminals(they do come out) & might jump fire to the wiper motor itself to see if it is functioning. Pull the connector off of the light switch & jump fire to the terminal for the interior lights. These test will help you pin down the open & give you the confidence to continue your search.
www.mymopar.com has wiring diagrams for your chally. Sears has cheap digital VOM's for under 10 bucks & sometimes as said a 3 dollar test light works good also. Happy hunting and any more Q's dont hesitate to holler.