Help with Rallye harness replacing standard harness 70 dart

70CRUSH said
Thanks to all. I haven't found a schematic for a 70 Rallye dash wiring. I do have the 70 Dart service manual showing the regular dash wiring. There are only a few challenges to sort out with tracing and continuity checks. I should be able to eliminate these one at a time. The Rallye harness I have is used and was for AC which I don't have, so some extras and some things not there for a non AC car but workable. My main concern is the bulkhead disconnect on the standard harness has white wirers running from the C and D positions but the Rallye harness has nothing in C or D. Plus the Rallye bulkhead has a White and a Black coming from the W slot where the non-rallye has just a black. Wondering if that white wire in the W slot takes the place of the white wires in C and D of the standard harness? If anyone has a thought on this that would be appreciated. Thanks.

I ran across something like that while helping a member make this standard to rallye change in a 72 model. A white hot wire came from somewhere, radio connector maybe, and went to a port in the bulkhead. A black wire was crimped in with it that carried the current on to the turn signal switch (I think, sketchy memory). There was nothing outside the bulkhead at this port so they had only used a bulkhead port as a junction location for the 2 wires and change its color. maybe so there wouldn't be 2 white wires at turn signal switch. The 68/9 diagrams would show that white wire added to radio connector going pretty much the same route but to power the reverse lamps instead of turn signals. I dont know who could keep all the changes straight in their head. Thats what diagrams are for.
The rallye panel always did have 2 switched hot wires to the circuit board. One was blue with white tracer and powered nothing but the voltage limiter in the fuel gauge. It came from the dash mounted ignition switch. 2 blue with white in the one terminal.
The other switched hot was black and powered the brake warning lamp. Anyway... at some year model the 2nd blue with white disappeared. On the standard panel, the one black switched hot powered brake warning, oil warning, and the voltage limiter. A harness built to connect to the rallye circuit boards will have switched 12 volts at 2 separate pins regardless where that power comes from or what color it is. Good luck with it.