Ok ill keep bumping this up for a while, im going to use this wiring diagram now because i don't have the harnesses on hand. I've figured out what connections i need to make from the quad 4 ECM to the fiero, the only thing i want to know is what is left intact on the C203 and C500 harnesses that is still fiero. It is an 85 duke without air conditioning an manual transmission.

I'll use this wiring diagram http://www.fieroaddiction.com/c203c500.html

I don't have connections for:

C203

E Tan Oil gauge Connect to oil pressure sender, 90 ohms at max pressure (not overly worried because i have an aftermarket oil pressure gauge and sending unit)

H Brown VSS feed for ECM Feeds buffered VSS signal to ECM when a magnetic VSS is connected to speedometer. Note 3 (no idea what to do with this)

J Pink TBI INJ1 Positive feed for injector. Hot in run, bulb test, or start. fused 5A
K Pink TBI INJ2 Positive feed for injector. Hot in run, bulb test, or start. fused 5A
(these both should be useless now right?)

M Black VSSB ground Connect to ground (do i ground this)

P Purple TCC Brake switch TCC brake. Hot in run, bulb test, or start only when brake pedal is NOT depressed (no idea about this either)

C500 I'm not quite sure of any connections as of yet, help would be great

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Calgary - August 1, 2004 Fiero Fiesta
@ SouthCenter Mall

E is oil pressure I guess you have aftermarket
H is cruise control
j and k I think you are right you don't use them but I will have to look at my car to be sure
M engine ground
P clutch solenoid
500 plug
A1 Ac dark green
A2 various lights/ g203 ground(trying to figure out my old notes) black
A4 clutch start switch purple
A5 fuse block red white
B1 speed sensor/cruise buffer yellow
b3 voltage regulator brown
c1 speed sensor small purple
c2 cool temp lamp tan
c3 tach white
d1 fan relay DK green/ white
d2 fan relay lt green /black
d3 cool temp switch @ ac pressure switch DK green
e3 ign coil pink
e4 fuse block red
Hope this helps any other questions just let me know.