What year / model? It is somewhat documented in some years of the service manual. "The big change" in wiring diagrams was 73, and they are VERY hard to follow "line for line"
You can download most years over at MyMopar. Some of them over there..........came from the guys here at FABO
MyMopar - Mopar Forums & Information - MyMopar Tools/Reference
Page 8-167 of the 72 manual shows it. That is for B body, the A is similar The original R and B ammeter wires are cut and taped off
