1987 r-10 / c-10 engine wiring help ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sweetk30 · 10-19-2018, 08:19 PM

i am looking for a diagram for the 1987 c-10 305/700r4 at the big plug on the firewall .

i am trying to separate the tbi harness from the gauge/starter wires .

since i am going holley sniper and dont need the massive tbi wire pack anymore .

here is what i got to figure out .

pink / black tracer - goes to main tbi harness .
-----
purple / white tracer - goes to main tbi harness .
-----
solid lt brown - goes to tbi main harness . and no not the alt wire i got that one .
-----
tan / black tracer - goes to tbi main harness
-----
BIG pink - it goes to TBI coil plug . so i think its key hot and crank . ?
-----
tan / white tracer - this is on the 2 wire oil pressure sensor top of engine behind intake .
-----
orange - this also is on the 2 wire oil pressure sensor top of engine behind intake .
-----
light purple - its going to the 700r4 trans plug .
-----

just to be clear i have the common known oil pressure gauge single wire . its light tan/orangish .

all ends were labeled before i pulled this from the engine . as i had un-pluged the main harness at the firewall block when body was pulled .

10-19-2018, 08:19 PM	#1
sweetk30 Registered User Join Date: May 2012 Location: horseheads,ny rust belt Posts: 2,794	1987 r-10 / c-10 engine wiring help ? i am looking for a diagram for the 1987 c-10 305/700r4 at the big plug on the firewall . i am trying to separate the tbi harness from the gauge/starter wires . since i am going holley sniper and dont need the massive tbi wire pack anymore . here is what i got to figure out . pink / black tracer - goes to main tbi harness . ----- purple / white tracer - goes to main tbi harness . ----- solid lt brown - goes to tbi main harness . and no not the alt wire i got that one . ----- tan / black tracer - goes to tbi main harness ----- BIG pink - it goes to TBI coil plug . so i think its key hot and crank . ? ----- tan / white tracer - this is on the 2 wire oil pressure sensor top of engine behind intake . ----- orange - this also is on the 2 wire oil pressure sensor top of engine behind intake . ----- light purple - its going to the 700r4 trans plug . ----- just to be clear i have the common known oil pressure gauge single wire . its light tan/orangish . all ends were labeled before i pulled this from the engine . as i had un-pluged the main harness at the firewall block when body was pulled . __________________ 77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great. Last edited by sweetk30; 10-19-2018 at 08:44 PM.



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