We are converting a 1969 B body to EFI. Instructions say ECU needs a wire to go to start AND crank 12volt power. Power cannot drop below 9 volts. We tried the ballast, it's a 4 pin ballast, but nowhere do we get sustained 9+ volts during start AND run.

I thought relay maybe? Would 6 volt at ballast pull in a relay?

What has been done for a 1969 B body to get voltage for start and run power at the ECU that works??