1957Z28

I have scoured the net and this site and this somehow avoids ANY discussion. The C100 terminal that goes through the firewall on the opposite side as the ECM and likely plugs into the fuse box.
Do I need to connect any switches etc. to any of these?
A4 is Power distribution Ignition Switch for example, do I just tuck this thing out of the way wrapped up so it can't get wet or what? I've spent a couple hours trying to figure this out and it's just left out of every conversion/swap discussion!

Tuned Performance

iTrader: (92)

c207 is used for injector power and ecm power switched and constant. Unless you are retrofitting the complete harness you don't need c100.

1957Z28

So part of that is great news, the C100 goes off the list of things I have to worry about. Thank you for that! That's likely why nobody seems to mention it.
Now the C207 that hangs down by the ECM, is there anything I have to do with that?
I'll start searching when I get done wrenching for the day, doesn't hurt to ask though.

Tuned Performance

iTrader: (92)

Most aftermarket wiring harnesses for the 1227730 ecm incorporate a ato fuse block for injector bank 1 and 2, A6 ign power to the ecm. G4 from the fp does to through c100 and on a f-body out a rear body connecter to the fp but that would not be a reason to keep c100. you should start bye stripping down the harness from the engine side to remove what you don't want, egr solenoid,ccp , air diverter solenoids fans ...

1957Z28

Found this, but still deciphering it all and it's for a Monte Carlo SS which
has some of the same stuff going on, these conversions are less than fun at times!:
NOTE: These pin-outs may or may not be the same for different years. You will have to check yours but this will be a useful guide. 15-pin connector -Cut wire on Pin B (orange) on car-side of connector -Cut wire on Pin C on car-side of connector and route directly to the 'check-engine' light (the original circuit goes through a 'light driver module' which will not work with the TPI ECM. I had to modify the light socket because it originally plugged into a ribbon cable that I couldn't easily tap into. The wire from Pin C is the ground for the light so you also have to run an ignition circuit (I used Pin F) to the other side of the light socket. -Pins B & G on engine-side of connector are power for the injectors. These need to be connected to an ignition source (I used Pin F). -Pin D on engine-side is goes to the alternator. On the L69 harness, this wire comes from the fuse-block connector so you will have to run a wire from the small brown wire on the L69 fuse-block connector to the brown/white wire (Pin D) on the engine side of the 15-pin connector. -Pin J provides serial data from the ECM and must be routed to ALDL Pins E & M. -Pin L is the circuit for the VATS (Vehicle Anti-Theft System) module (if equipped). If you don't have a VATS module and matching key you will have to make a signal generator to provide the equivalent signal. You can make one with about $10 of electronic parts and an electronics whiz. -Pin P is the purple wire that runs to the transmission. I believe it is the TCC control. On the TPI wiring harness, this wire runs through the fuse-block connector so you will have to run a wire form this pin to the purple wire on the fuse-block connector.


Since this diagram gives me no idea what needs power, what would rock is ign 12V with key to J (which I suspect?) etc. I found this following for an 86 Z28:" i randomly decided to use the test light on the C207 connector since i read that i think terminal D is for the fuel pump( which i need to wire up as well). With the key in the off position, the C207 connector from the dash has 12v at terminals C, D, G, F, J, M and P." and "Check engine light aka MIL is in the C207, BRN/WHT
Speedo is in the C207 GRY or BRN for 90-92 camaros and 86-92 birds. Older years are mechanical and require a mechanical driver box such as cable-x" I'm kind of narrowing it down, but since I could fry my memcal and ecm this really needs to be right.
So to simplify; 1991 305 TPI, C 207 what's hot (and when, w/key?) and is anything grounded?
11 Wires and I don't need the speedo, so 10 wires to deal with.

darbysan

If you go to my web site on the TPI page, I have a spreadsheet for wiring that shows what pins are good, and what needs to be changed for the C207 connector. Mine was for an '86 F-body harness going into an '85 G-body, so your mileage may vary.
https://sites.google.com/site/darbyselky/home

Tuned Performance

iTrader: (92)

at here are four grounds all off the ecm to the back of the passengers side cylinder head. you might find a eyelet on the harness. IIrc the o2 ground is on a eyelet to the back of the drivers side head.
The only wire you won't use on c207 is P the 4k optical vss signal unless you get a autometer speedometer.
Most schematics don't show c207 but the wires go directly to the ecm.
http://tpiparts.net/1227730_pinout_diagram

1957Z28

Awesome project there!
I had a 86 Monte SS back in the day and always wanted to put a TPI motor in that, Chev dropped the ball there. Insane build sheet and data compilation. I don't have an ALDL, someday along with a check engine light somewhere (I think this grounds to C). Looks like G gets power with the key, and I don't have a VSS yet, that's on the list after I actually get it running (it's a budget thing, hopefully within just a few weeks, depends on what the finishing touches run here). I have a few days before I'm left with everything in place but this C 207 enigma, so fingers crossed. Hundreds of TPI swaps have been done with factory harnesses, so not reinventing any wheel here.

1957Z28

There are eyelets on the harness grounded to the back of both heads. All that is straight forward and as it should be.

Tuned Performance

iTrader: (92)

I believe the drivers side head ground is also the aldl pin A.

1957Z28

Alright, well I've got more than $200 worth of my time into researching and trying to make the factory wiring harness work, screw this noise. I'm getting a harness that will work perfectly for my application made. On a brighter note for those of you doing swaps in F bodies that can use factory harnesses, I have 2 in awesome condition that I'll let go for cheap. 87' MAF and a 91' SD both 305 tpi with auto's. $95 shipped for either one.

Yeah the classifieds; I'll be getting pics today and do that, just closing this thread off.
Thanks everyone for the information.