I'm not positive but the voltage regulator plug may be different from 69 to 70 and with the changed 70 dash the wiring may be changed there too. There is a company in R.I. that makes harness's and you could inquire. www.riwire.com Let me know if they make one or will make one i've got a 70 AMX as well.
I've got a complete color coded diagram for a 70 amx/javelin.It's the same one in the 70 tsm (technical service manual). Let me know and I could scan it probably in a couple of sections and you could tape it together.