1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Useing a TBI harness for a carbed engine

Discussion in 'TBI & EFI Conversions' started by Curtis306, Aug 26, 2018.

  1. Curtis306

    Curtis306 Junior Member

    Posts:
    1
    Likes Received:
    1
    Joined:
    Aug 26, 2018
    Location:
    Canada
    First Name:
    Curtis
    Truck Year:
    1986
    Truck Model:
    K3500 crew
    Engine Size:
    350
    hi I am building a 1986 k3500 crew with a carbed engine and I have a 1991 suburban parts vehicle with a TBI engine. The wiring harness is in immaculate shape and was hoping to use the complete harness in my crew. Can anyone help me with instructions of which wires can be removed from the engine and cab/computer harness. Thanks in advance if you are able too
     
    Summerof41 likes this.
  2. yevgenievich

    yevgenievich Full Access Member

    Posts:
    4,023
    Likes Received:
    1,652
    Joined:
    Mar 1, 2014
    Location:
    Texas
    First Name:
    Viktor
    Truck Year:
    1991
    Truck Model:
    V2500 burb
    Engine Size:
    5.7
    It is separated enough in the harness that you can mostly just remove all wires that go to the computer and it should be carb ready
     
  3. Charlie

    Charlie Mopar by Birth. Chevy by Choice.

    Posts:
    1,788
    Likes Received:
    830
    Joined:
    Aug 2, 2017
    Location:
    Euless, Texas
    First Name:
    Don
    Truck Year:
    1974
    Truck Model:
    Cheyenne 10 LWB
    Engine Size:
    350/TH350/AC/4 BBL Quadrajet
    :welcome:
     
  4. Summerof41

    Summerof41 Junior Member

    Posts:
    1
    Likes Received:
    0
    Joined:
    Nov 30, 2020
    Location:
    Wilsonville Oregon
    First Name:
    Paul
    Truck Year:
    1990
    Truck Model:
    V20
    Engine Size:
    350
    Curtis 306 - did you complete this conversion?
    Did you find it simple to separate the OBD-1 and TBI elements of the harness?
    I am considering something similar in my 1990 V20 Suburban (deleting the TBI and installing a carb)
    Would love to know what you ended up doing?

    Cheers.
     
  5. fast68chevy

    fast68chevy I am the original fast68chevy

    Posts:
    151
    Likes Received:
    67
    Joined:
    Oct 17, 2020
    Location:
    LINCOLN IL
    First Name:
    RANDY
    Truck Year:
    1975
    Truck Model:
    C20
    Engine Size:
    350
    carb motor just has coolant temp and BATT wire for the HEi coil and oil pressure switch and alternator wires. prety simple basic an the TBI harness has totally different wiring for ignition and coil and all that,, theres next to nothing that shares or is same as HEI/carb the carb HEI harness is so stripped down basic that it cold definitely and easily just be repaired and reused. and the HE is really just a standalone lage guage BATT wire which is just an igniton switch controled 12v full power wire for the coil and thats it for the ignition system wiring as far as the engine harness part of it goes.. its just so super basic stripped down simple easy... and the alternator is only three wires.. also so really super simple basic easy,,, the smaller TBI era alternators are different from the larger/case common carb HEI-era ones..
     

Share This Page