Hello 87 gmc tbi in to an 76 gmc Scottsdale help

[Dwippie]

Hello I have a donor 87 gmc pu that I'm looking For a good wiring diagram That will tell me what needs to be hooked up where what needs power and what needs a switch and relay any help would be greatly appreciated. It's going into a 76 Chevy Scottsdale I believe I have the common wires figured out starter alternator, fuel Sending unit thanks again Dwippie of Washington state

[dave w]

Post #2 in this thread: http://www.gearhead-efi.com/Fuel-Injection/showthread.php?304-1227747-ECM-Information-42 has the wiring diagrams for the 1227747 TBI computer ( most all TBI Computers from 1987 to 1989 used the 1227747 ). Post back if you need a wiring diagram for a TBI Computer that IS NOT the 1227747.

dave w

[89S10_Project]

Post #2 in this thread: http://www.gearhead-efi.com/Fuel-Injection/showthread.php?304-1227747-ECM-Information-42 has the wiring diagrams for the 1227747 TBI computer ( most all TBI Computers from 1987 to 1989 used the 1227747 ). Post back if you need a wiring diagram for a TBI Computer that IS NOT the 1227747.

dave w

drawing from memory here, but I believe the 8062 series ECMs have a similar pinout- my 4.3L V6-factory-powered 89 S10 Blazer ran that ECM in stock trim. When I installed the 5.7 TBI motor out of an 89 C1500, I just unolugged my ECM and plugged the one that came with the motor (7747) in. The only "wiring" I needed to do was elective- I extended the entire harness by 3' for peculiarities in my application. Didn't have to cross any wires, move pins, or anything.

That said, I couldn't tell you if you could go color-for-color between the two ECM pinouts, but the wise swapper will ignore wire color for pin-header position.