Electrical is gone

You can download useable wiring diagrams here:

http://www.mymopar.com/index.php?pid=31

these two:

http://www.mymopar.com/downloads/1972/72ValiantA.JPG

http://www.mymopar.com/downloads/1972/72ValiantB.JPG


and here at FABO, this thread, you can download an entire '72 service manual:

http://www.forabodiesonly.com/mopar/showthread.php?t=132309&highlight=manual,+download

the link:

http://www.abodyjoe.com/pictures/Misc. car info/1972 Plymouth Chassis Serv Man.pdf

Do ANY accessories work? Have you checked, is the fuse box getting power?

The fuse box is actually supplied from THREE sources

1 The hot buss, hot all the time feeds some of the fuses such as interior lights and brake lights

2 the accessories buss is fed by the ignition switch and powers things that are switched off with the key, like the radio, wipers, heater

3 the third is tricky. the headlight switch, which is several switches in one box, gets headlight circuit power directly off a splice in the harness after the ammeter. There's a circuit breaker on the light switch, ONLY for the head light circuit

The light switch ALSO gets power from the tail light fuse, and that part of the switch then controls the dash lights, so dash light power LEAVES the headlight switch, THEN goes to the instrument panel fuse. So that THIRD source is a little tricky

You need to take a test lamp and see if the fuses are getting power.