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Buzzman72 01-27-2013 08:00:21 74.134.25.51 Report to Moderator	Lanse, of course you realize that you're going to have to run the ECM for everything to operate. Now, I know a LITTLE here and a LITTLE there...like, the TPS has to have a reference voltage of 5 volts... Your main voltage HAS to be 12.6 to 14 volts for everything to function; once the system goes below 10 volts, funky and not-so-funny things begin to happen. So make sure your battery, cables, grounds, and alternator are in AAA+++ condition to begin with...'cause this ain't gonna be like dealing with a 6V system with a generator and a magneto, that'll continue to run with a wimpy electrical system once you get it started. There's a chart of the pin-outs for some of the common ECM's GM used, in the link below. Should be somewhat helpful...I hope. I know some of the "aftermarket" TBI systems use the GM #1227727 ECM, but I don't know if perhaps it's not as common now as it used to be. ECM pin outs [Reply]   [No Email]
Buzzman72 01-27-2013 08:47:45 74.134.25.51 Report to Moderator	Re: Wiring a 305 tbi to run? in reply to Buzzman72, 01-27-2013 08:00:21   This link may be MORE helpful... GM ECM cross references and schematics [Reply]  [No Email]