[Gmecm] Key-On Power for 7730

[terry]

You could spice those together it will work,the ecm
has to have at least 10 volts during cranking.
We just did a dodge dart and we ended up using those
ign+ circuits to power a relay and it works well.
Terry
rosesandwrenches.com 

--- Clair Davis <clair.davis at charter.net> wrote:

> Background... I've got a 69 Plymouth Valiant I'm
> multipoint-injecting with a
> 7730 box.  I've got two wires left to run, and one
> of them is killin' me:
> Key On Power.
> 
> On my old Plymouth, the ignition switch has 5 wires:
> BATT, START, ACC,
> IGN-1, and IGN-2.  IGN-1 is the "run" power to the
> coil, dropped down with a
> ballast resistor to keep the coil happy.  IGN-2 is
> 12V straight to the coil
> for hotter sparks while cranking.
> 
> The IGN-1 circuit is DEFINITELY dead while cranking,
> and IGN-2 is ONLY hot
> while cranking.  Once the engine fires, you let up
> on the key, the switch
> rolls back to IGN-1 and you go on about your way. 
> Problem is, I can't tell
> how long the dead skip is in the transition between
> the two circuits.
> 
> Is this a problem?  Seems like it might be, as the
> "key on" signal seems to
> be the trigger for the whole start-up routine with
> the ECM.  Is a GM
> ignition switch one where there is no break in the
> power from "run" to
> "start" and back, or am I overthinking things? 
> Mopar guys that run MSD
> ignitions splice IGN-1 and IGN-2 together for the
> MSD to work, but that's
> hardly the same animal.
> 
> Thanks in advance!
> 
> Clair
> 
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