The Stovebolt Site Forums The Shop Area The Electrical Bay Missing schematic

Does any one know where I can get a wiring diagram for 1985 and 1986 S10 trucks with TBI? The chilton manual for those years has a supplement saying that there are TBI tucks but they did not update the wiring charts. Put an 86 V6 TBI in an 85 4cyl TBI truck. Took entire harness to engine and computer with the engine but used fuse box and harness from the cab. Now it blows the ECM1 fuse when switched on. Book said all the same but gives no info on TBI wiring for V6 It was obviously different under hood. pin out must be different but can't figure it out without the schematic .

Find a diagram for the 87 S-10. It had the throttle body injection. Check the hot wire connection on the computer and the ground wire. Seems like I remember them being opposite on the earlier models. You will have to cut it loose at the computer and run a new one, if my memory is right.

Thanks. I worked around the problem by using the instrument panel and harness from the truck the engine came from. But I believe you are correct. I checked the two harnesses and the one that matched the motor had the Purple and Yellow wires (on same plug at fuse panel) jumpered together. By the time I discovered this I had both out and the replacement painted. Also I emailed haynes manual company and they sent me the schematic for the TBI. Thanks again.