I just pulled the entire TPI harness and computer in preparation for my 383ci carb swap. Am I correct in assuming that I do not need any part of the TPI harness? The necessary connections all come from the drivers side firewall (alternator, lights, wipers, etc)
Also, the harness had four bundle connections under the dash: 2 went to the computer and the other two go where? One was a 3-wire bundle and the other is a 14-wire bundle. I know that somewhere in there is the service engine light (3 wire?) and the 14-wire bundle maybe controls the gauge panel?
Either way, these were all part of the TPI harness. I should be good to go wiring everything as long as I put new gauges and sending units in, right? The TCC lockup will be controlled by a vacuum switch on my StreetFighter.
Thanks for any help you can offer.

 

Anyone? The only thing I can think is the 14 wire runs the temp sender, tach, etc....

 

One connector goes to the burnoff module mounted piggy back to the ECM.
The 3 wire connector I know one goes to the ALCL connector. Not sure about the other two wires in that connector.

 

ECM to Chassis connector pin outs:

Rectangular chassis connector male pin view:
__ __
A B C D E F G H
J K L M N P R

Square chassis connector male pin view:
A B C
F E D


'84 Auto trans, rectangular connector

A Brown; Air solenoid switch to ALDL connector; pin C
B Open
C White / green; To check engine light
D Open
E White / black; ALDL connector diagnostic enable
F Pink / black; Ignition power from 10 amp fuse to ECM & air solenoids
G Open
H Tan / black; TCC lock signal to ALDL connector

J Open
K Brown; VSS output to ECM
L Open
M Black / White; Ground for ALDL connector & park / neutral switch
N Orange / black; Park / neutral switch
P Purple; Power to TCC from TCC power switch at brake pedal
R Pink / black; Gauges fuse ignition power to throttle kicker relay

'85 Auto trans, square connector

A Pink / black; Fuel injector power
B Open
C Brown; Primary fan relay
D Pink; Fuel injector power
E Open
F Open


'85 Auto trans, rectangular connector

A Brown; Air solenoid switch to ALDL connector; pin C
B Red / black; Fuel pump relay NC contact
C Brown / White; SES light
D White; Fuel pump relay common contact
E White / black; ALDL connector diagnostic enable; pin B
F Pink / black; Ignition power to ECM
G Pink / black; Ignition power to air control solenoids
H Tan / black; TCC lock signal to ALDL connector

J Orange; ALDL connector serial data from ECM
K Brown; VSS output to ECM
L Open
M Black / White; Ground for ALDL connector & park / neutral switch
N Orange / black; Park / neutral switch
P Purple; Power to TCC from TCC power switch at brake pedal
R Purple / white; Cold start injector power; hot in start only



'87 Manual trans, square connector

A Pink / black; Fuel injector power
B Green; Reverse lights (man trans only)
C Brown; Primary fan relay
D Pink / black; Fuel injector power
E Open
F Blue; Reverse lights (man trans only)


'87 Manual trans, rectangular connector

A Brown; Air solenoid switch to ALDL connector; pin C
B Orange; Fuel pump relay NC contact
C Brown / White; SES light
D Brown / white; Fuel pump relay common contact
E White / black; ALDL connector diagnostic enable; pin B
F Pink / black; Ignition power to ECM
G Tan / purple; Ignition power to air control solenoids
H Open

J Orange; ALDL connector serial data from ECM
K Brown; VSS output to ECM
L Open
M Black / White; Ground for ALDL connector
N Open
P Open
R Purple / white; Cold start injector power; hot in start only

'92 Auto trans, rectangular connector

A Open
B Pink / Black; LH fuel injector bank power from 10 amp fuse
C Brown / white; SES light
D Gray; 4000 pulse / mile VSS output from ECM to speedometer
E White / black; ALDL connector diagnostic enable; Terminal B
F Pink / black; Ignition power from 10 amp fuse to ECM
G Pink / Black; RH fuel injector bank power from 10 amp fuse
H Tan / black; TCC lock signal to ALDL connector; Terminal F

J Orange; Serial data from ECM to ALDL connector; Terminal M
K Open
L Blue; Pass key module signal to ECM
M Open
N Orange / black; Park / neutral switch to ECM
P Red; 2000 pulse / mile VSS output from ECM to cruise control module
R Open

 

Now thats the complete type of answer we wish all questions were handled ! good work TIm.

 

are you cutting apart that tpi wiring harness? im in need of one, if your not using it and its in good condition let me know if you will sell it cheap, my projects slowly dieing due to college and lack of funds, let me know
matt

 

Thanks for the info!:hail:
The harness is already sold....sorry.