Strange starting issue

I already added a Painless secondary fuse block with it's own feed to the battery to run additional electronics. When I tried to connect the ECU to it I found that during cranking the switched source in the original fuse block used to enegized the relay for the secondary fuse block loses power. I think the new plan would be to tie the switched circuit signal wire to the voltage regulator wire since it is very low draw. Then I will tie the ECU to the secondary fuse block.

The Painless secondary fuse block has it's own power feed to the battery protected by a circuit breaker right by the battery. The fuse block has 1 constant 12V circuit and 2 switched 12V circuits. The seconday fuse block uses a signal wire to an existing switched circuit to power the relay that switches on the 2, 12V circuits. I used the secondary fuse block to power my stereo and my gauges inside the car.