Converting to HEI, need 12v (Ign 12) source
That wire in earlier cars used to be simple..........came off the ign switch, went straight through the bulkhead and to the ballast
In the 74 book I show a splice where it branches off to the under--dash interlock box. Is it possible it got cut there?
I would access the ignition switch connector immediately and check there
Only place I see losing it is at the switch connector
at the branch splice to the interlock
or through the bulkhead connector