87 C100 Connector for Trans Am
 

I'm installing an aftermarket fuel injection system in my 87 Trans Am. I am looking for a pin out diagram for the C100 connector. I searched and found a post referencing some diagrams but they are for 85 and 91. I know there were some changes made throughout the years so I want to make sure I get the correct pin outs. Does anyone know where I can find said diagram for 87? Thanks!

Re: 87 C100 Connector for Trans Am
 

Re: 87 C100 Connector for Trans Am
 

Thank you. Why does it look like my ac compressor is routed to that connector but it doesn’t say anything about ac on the pin out diagram? I’m trying to eliminate everything I don’t need from the harness. I already did the ecm side. Now I gotta work on the c100 side.

Re: 87 C100 Connector for Trans Am
 

AC control comes through it's own hole in the firewall, it's to the left of the heater box, or right if you're in the front of the car looking at the firewall.

Re: 87 C100 Connector for Trans Am
 

That's fro a Camaro so it's kinda' incomplete when dealing with a Firebird. The Firebird C100 was more 'complicated' than the Camaro version due to circuits for electric VSS and the flip-up Headlights.


The schematic found on this page was pulled from the 87 Firebird Shop manual: 87 Firebird is in about the middle of the page. https://berlinetta.info/C100.htm


This page has the C207 and C221 plug info: https://berlinetta.info/C207.htm


Hope this helps,........ Good Luck Michael !


:driving:

Re: 87 C100 Connector for Trans Am
 

Trace every wire back. There are some wires tied to the fuse box bussed that can be used in aftermarket fi for key on 12 volts.

Re: 87 C100 Connector for Trans Am
 

Make sure it also retains 12v in start. Some circuits are cut off under crankinf

Re: 87 C100 Connector for Trans Am
 

Thanks guys. I am aware that I will need a 12V source that is hot while in run and while cranking for the new ECM. I should be able to find one in the wiring diagrams I have.

Re: 87 C100 Connector for Trans Am
 

Look at c207 for a hot wire. Iirc should be one with a pink/blk stripe.

Re: 87 C100 Connector for Trans Am
 

The c207 pink black emissions is bussed to the left side of fuse panel if sitting in seat. It entered the bay through c100 harness pin A7. So basically you could use it in the interior for 12 volt key on and in engine bay 12 volt key on for relays such as fuel pump or fans. Tied to aftermarket ecu for turn on it's basically zero amps. But on some harnesses be careful. For example as I dont know what you are running in the car a 4l60e harness for Holley dominator key on 12 volt pulls 5 amps to run the trans solinoids. What system are you working on?