I hate wiring
Also if your 74 is stock wiring, you need to consider bypassing the seat belt interlock. 74 is the only year to have this. Look under the hood on the driver side fender for a box about the size of a horn relay with a big red reset knob. Find the "yelowish" wires and splice them permanently together if not already done
67dart273, seat belt interlock - Google Search
When the two yellow wires are jumpered this prevents the interlock from disabling the starter relay. This was an incredibly stupid U.S. Federal safety rule that lasted one year before the pubic revolted
Also if your 74 is stock wiring, you need to consider bypassing the seat belt interlock. 74 is the only year to have this. Look under the hood on the driver side fender for a box about the size of a horn relay with a big red reset knob. Find the "yelowish" wires and splice them permanently together if not already done
67dart273, seat belt interlock - Google Search
When the two yellow wires are jumpered this prevents the interlock from disabling the starter relay. This was an incredibly stupid U.S. Federal safety rule that lasted one year before the pubic revolted
