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What are these connectors?

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Old Oct 28, 2024 | 05:17 PM
  #1  
shaynecastongua's Avatar
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From: AL
Car: 1985 Trans Am
Engine: Chevy 355
Transmission: T5 NWC
Axle/Gears: 3.23
What are these connectors?

Hey everyone, got an 84 shell I'm building and transferring the wiring harness over from my 85 TA. Got these two connectors in the main harness, currently they're running behind the dash above the radio. I dug through the wiring diagram on Austin third gen but can't ID them. Anyone know what these are?

I removed my ECM from the 85 a long time ago. Adding AC back in this time around but I have that harness all squared away. Are these ECM harnesses? The photos are of me pulling them up through the dash speaker area, but they could go down below.







Thanks!
Shayne
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Old Nov 1, 2024 | 01:56 PM
  #2  
John in RI's Avatar
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From: RI
Car: 1984 Camaro Berlinetta
Engine: LT1
Transmission: T56 6-speed
Axle/Gears: 4.11 LS1 Rear End
Re: What are these connectors?

Plugs are the "C207" dash-to-ECM harness connectors.

This set of plugs is very specific from year to year and are also dependent on the engine / tranny type too. I've ID'd the circuits leading to the C207 plugs for most years ---> but carefully double check my findings against your harnesses if you decide to use my info for your project. ( Notes for C221 are for some 85-87 Fuel injected cars; IIRC; a carb car didn't use C221 )

1984 C207

PIN Color From / To (Notes)
A Brn ALDL / ECM (AIR control)
B Dk Blue BU Fuse / Back Up Switch ( T5 only )
C Wht/Grn Light Driver / ECM
D Tan Oil Pres / Gauge (L4)
E Wht/Blk ALDL / ECM (test)
F Pnk/Blk IGN fuse / EGR-ECM
G Lt Green BU switch / Rev Lights ( T5 Only )
H Tan/Blk ALDL / TCC-ECM
J Org ALDL / ECM ( L4)
K Brn ECM / VSS
L Tan/Wht Fuel Relay / Fuel Pump ( L4 )
M Blk/Wht VSS, P/N switch / Grd
N Org/Blk ECM / P/N switch
P Ppl Brake / TCC ( V8 )
R Ppl Crk Fuse / EFI (L4)


1985 C207

PIN Color From / To (Notes)
A Brn ALDL (pin C) / ECM (AIR control)
B* Dk Blue BU Fuse / Back Up Switch ( V8 T5 )
B* Red ALDL / Fuel Relay ( V6 - TPI )
B* Org/Blk FP FUSE / Fuel Relay ( L4 )
C* Brn/Wht ECM / CE Light ( L4- V6 - TPI )
C* Wht/Grn Light Driver / ECM ( LG4 & L69 )
D* Blk/Org FP/INJ fuse / Fuel Relay ( L69 )
D* Tan/Wht Fuel Relay / Fuel Pump ( V6 )
D* Lt Blue Fuel Relay / Fuel Pump ( TPI )
D* Tan Oil Pr Sensor / Oil Pr Gauge ( L4 )
E Wht/Blk ALDL / ECM (test)
F Pnk/Blk IGN fuse / EGR-ECM
G* Dk Blue BU Fuse / Back Up Switch ( V8 T5 )
G* Pnk/Blk Gage Fuse / MAF Relay ( V6)
G* Pnk/Blk Gage Fuse / Burn Off Relay ( TPI )
G* Pnk/Blk Gage Fuse / Air Cond Relay ( L4 )
H Tan/Blk ALDL / TCC-ECM
J* Ppl Starter / Fuel Relay ( L69 )
J* Org ALDL / ECM ( L4 - TPI )
K Brn ECM / VSS
L Tan/Wht Fuel Relay / Fuel Pump ( L4 - L69 )
M Blk/Wht VSS,P/N switch / Grd
N Org/Blk ECM / P/N switch
P Ppl Brake / TCC
R Ppl/Wht Crank Fuse / Cold Start-ECM ( V6-L4 )


Plug C221

A Pnk/Blk Inj2 Fuse / Even Fuel Injectors
B Lt Green Back Up Switch / BU Lights ( V6-T5 )
C Brn Fuel Pump-Fan Fuse / Fan Relay ( V6 - TPI )
D Pnk/Blk Inj1 Fuse / Odd Fuel Injectors
E
F Dk Blue Back Up Fuse / Back Up Switch ( V6-T5 )


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Old Nov 1, 2024 | 06:53 PM
  #3  
shaynecastongua's Avatar
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Joined: Jun 2016
Posts: 198
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From: AL
Car: 1985 Trans Am
Engine: Chevy 355
Transmission: T5 NWC
Axle/Gears: 3.23
Re: What are these connectors?

Thank you John! I was pretty sure they were ECM-related, but now I know for sure. Good thing I got rid of my ECM long ago, so I can tuck these connectors away and not worry about them. Thanks again.
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