Hei conversion Intermittent start?

Just read you notes at top of page. 11.5 is really low, either your losing a lit through the bulkhead, or your battery is low, or both. 9-10 volts will not fire the HEI, thats the problem! Cranking is bringing the voltage too low. What is voltage of battery, and battery when cranking? Charge the battery, and recheck the voltages. I put a relay on mine to get max voltage.