Putting a GM TBI system on my 1972 Ford F-250

[akforceten]

When i pulled this harness from the truck there are i plugs that go to the computer then about a foot down is 2 black plugs that go on to a clear double plug .coming out of this plug is a purple wire that is spliced to a purple/white wire and a resister with 2 purple wires on the other side . i cant seem to find this in any wiring diagram oh yea there is a black plug with another resister in it what is this?

[EagleMark]

If it does not come from or go to ECM, then it's not something EFI related...

[akforceten]

Thank you an no it doesnt goto or come from the ECM so it goes on the chopping block.

[mmigacz]

When i pulled this harness from the truck there are i plugs that go to the computer then about a foot down is 2 black plugs that go on to a clear double plug .coming out of this plug is a purple wire that is spliced to a purple/white wire and a resister with 2 purple wires on the other side . i cant seem to find this in any wiring diagram oh yea there is a black plug with another resister in it what is this?

I know there is a purple and white wire that goes from the ECM (pin C9) to the starter solenoid. I'm not quite sure if it does anything, maybe it lets the ECM know when the starter is cranking.

[EagleMark]

Yup! Handles Cold Start Crank Fueling.

[derbydad276]

so how is this going???

[akforceten]

well the engine is getting ready to go back to the machine shop for balancing then i get to assemble it an put it in the truck

[akforceten]

Sorry for the long wait to update but i have 2 fords that i'm going to do this EFI thing to.so after a ton of research i went to work an got a engine wiring harness out of a 1990 suburban computer 7747. I'm amazed at how simple it was to prep well here's some pics

[akforceten]

Okay i got the first harness done today.I eliminated the EGR knock sensors an the ESC . These things will turned off when computer is reflashed. For timing control i'm using the ignition module out of the GM distributor along with the GM coil to. ok here some pics of the finished harness





soldering wires
















I got it stand alone 2 grounds 1 batt 1 key on source. I will be using 2 relays on thw batt an key on wired