new engine wiring harness install on 1964

[mikeshome]

Doing an engine swap 350 with HEI ,Bought a new engine wiring harness that plugs into firewall by heater box. There are 3 wires at the starter purple trigger wire a small yellow on other small solenoid post that joins the red at the HEI and a black with a large grommet. Does the black go on the positive with battery cable ?When i do this temp light comes on and i have low power at HEI plug all the time and full power at crank only. I know green is temp wire i am not using. If i use the old HEI wire from the fuse box that old owner had and leave the black at starter off truck will start.