Need some help with the Fan1 circuitry of the ‘7730 ECM, and in particular Pin E8. The pin-out document (here: http://chevythunder.com/fuel%20injec...%20pinouts.htm)
shows that Pin E8 provides 12v with Key on and 13.9v with engine running. Is this correct, or does E8 actually provide a ground to the relay?

Here’s why the question. My Fan 1 relay is wired as follows (which appears to be in accordance with the GM manual):
Pin 87 – 12v to Fan 1
Pin 30 – Battery 12v
This provides 12v to the grounded Fan 1 when the relay coil is energized via Pins 85 and 86.

But here is the wiring for Pins 85 and 86:
Pin 85 – 12v from Ignition Switch
Pin 86 – To Pin E8 of ECM
With this wiring, how is the circuit from Pin 85 to 86 completed if E8 is Positive 12v? Doesn’t it take a ground from Pin E8 to cause the relay coil to be activated?