1969 dart alternator problems

I had similar problems with my 69 Dart. With the battery in the trunk, holley blue electric pump and relay, electric fan and relay, tach and MSD ignition, you will almost need to bypass the bulkhead connector. you also need to go over every and all connections and double check connections and grounds. That is just to much load for those old systems. I have a new powermaster (i think 70 amp) alternator, and when youd start the car it would just go to full charge because it was getting a weak voltage signal at the regulator. I kept the bulkhead connector hooked up, but also ran a bypass wire directly to the starter solenoid battery connection. that took care of my problem. With varying voltage at your fuel pump, your pressure has to be all over the place!