7747 A/C enable

[JTesta1966 at aol.com]

In a message dated 8/4/99 11:31:35 AM Eastern Daylight Time, 
ober_b at hotmail.com writes:

<<  
 on the relay and swap back and forth w/ the computers, but I was thinking 
 that the point of *electronic* fuel injection is ease/ improve recalibration 
 through software.  (That why we dispise carburetors, ladder logic, and 
 hydraulic logic,as mechanical logic controllers, right?)
 You guys are smart, I  >>

Only prob there is the difference between grounding and applying power is 
typically the HARDWARE, like maybe whether the circuit uses an invertor or 
not, etc. AFAIK, you cant change the POLARITY of a connection thru siftware. 
I think the CPU says "turn on AC relay quad driver", and depending on the 
wiring on the board it'd ground, or go to power. A guy more experienced with 
electronics would haveta answer that. Granted I've only played with the cals 
in my GN, but there seems to be no spot that says "go high or go low", just 
if AC request = yes then check for conditions, if conditions are met (run 
timer, TPS etc) then enable AC relay.

Others please step in if I'm wrong. And if this were the GN list, I know you 
would :-P

Jim