trying to figure out where c207 is for wiring for a dikota digital sgi100bt.
a lot of my wiring is ripped out and no longer have a ecm due to swap
originally a 1986 305 tbi t5

 

Under the dash housing,... pass side. This is a pair of 2 plugs that connect the dash harness to the engine harness. 85-88 fuel injected cars also had 1 other small plug (C221) in the same location. If your ECM is gone than the ECM harness might be gone too; meaning the 2 dash-to-ECM connectors might just be hangin' under the dash and easy to find.

When the ECM harness is removed from a 86-89(?) Firebird you will loose the electric speedo VSS ground wire, and thereby loose your speedo. You can get the original speedo working again by connecting the VSS buffer to ground again.

This is an outline I made of the C207 (and C221) plugs for the 85 Thirdgen..... PIN "M" is the BLACK/White wire that you need to splice a ground wire from the plug to body ground in order to get the VSS and speedo working again.

** If you lost your reverse lights when you removed/unplugged the ECM harness during the carb swap,... C221 has the reverse light wiring too.


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 )

 

thanks man i really appreciate it