i'm looking for the proper wire conections for my 70 challenger 440 with mopar electronic ignition. thanks in advance for any help!

Here is a site that has wiring diagrams from 1972 to 76.

http://www.mymopar.com/72to76_wiring.htm

thanks, i've seen that already. i have a black w/yellow trace and grey w/black trace terminated together? i'm thinking neg side of coil, but not sure? it's a new eng harness from year one for upgrading to electronic ign.

The black w/yellow trace and grey w/black trace terminate together at the negative side of the coil. The grey w/black trace goes to the tachometer, and the black/yellow wire goes to the electronic ignition box.

that's great! thanks for spending the time to help!