Does anyone have a wiring diagram for the above they could scan and post or e-mail me? I'm doing the dash now, and the new wiring harness has some differences from the one I took out. I'd rather be safe than sorry. A whole diagram would be just as welcome. Thanks guys.

Ebay Item #370136172523, for 71 Roadrunner, Satellite. Has the Rally Guage wiring added on the diagram, I know......I bought one for my '73. Excellent, I figured everything out before I installed it, and only had a cpuple of minor problems.

Go to the following wedsite (near bottom) and print the ones you need.
Ron

http://www.mymopar.com/66to71_wiring.htm

I posted this ones on 3rd gen charger website... pretty sure will work to you:

71 Charger diagrams

I hope they will be clear enough to you

but hey! 72 could it be slightly diff, mainly because seatbelts light is driven by a different relay ( not the time delay like 71 ) and switches/sensors related, and if Electronic ignition equipped.

Then we have:
73 underdash rallye harness

where you'll find the seatbelts light wiring differences, and some other wires turned around onm bulkhead compairing with 71 ( windshield washer wiper location, horn, extra NSS ground inside cab, maybe some more ). Lowe fuel indicator wasn't anymore an option, because the diff signal ( negative/positive ) being driven by bulbs on insert to both years. Wiper switch is bigger and diff kind of plugs between 71 and 72/74s, but still wires are the same

If you have a 72, you can work with these diagrams mixing them up.

Being you have plymouth the REAL bif diff with charger is the forward light harness, but maybe only about the hardware and plugs to parking lights, but cavities locations and wire colors are the same on bulkhead.