You need a wiring diagram & a test light before you can proceed. Then test the switch first. There is a hot wire to each side. See if current going thru ea. wire when you flip indicator right or...
The automatic uses Mopar ATF+4 unless it is a 4500 or 5500 chassis cab, then it uses special fluid from Dodge for the AS68 trans.The manuals used 5w30 until 1993, the 5 and 6 speeds from 1994 to 2005...