Is it necessary to install a chassis ground from the negative side of the HVC-2 coil? Reason for asking is... I just installed a MSD 7531 and Holley Dominator ECU with crank sensor and hall effect cam sync. I have no spark to the distributor. I disconnected the white wire from the ECU and 7531, and the coil boot from the distributor. When I grounded the white wire I did have spark to the coil boot. In the wiring diagram from Holley it shows a separate ground wire coming from the negative side of the coil to the chassis ground. I did not notice until now while reviewing the diagram. but I did not run a separate ground to the coil. All that is hooked up is the orange and black wires going to the 7531. FYI. The way it is wired I am using the ECU to control the timing and the 7531 to deliver it.