Onewire alt. don't go to regulator - it is just one wire and it goes to 'alt' wire in the harness for the 502. It won't give any output volyage until you wing the motor to above 2500rpm. And you don't run a wire to the indicator lamp on the dash. The insides looks pretty normal to me, i'd put it back together and on a motor and lite off the motor and check for voltage - no wireing to the altenator, just look for voltage on that stud.