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Thread: Need help merging together wirings of 1990 5.7/350 in cabin with 1998 5.7 vortec eng

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  1. #1
    Super Moderator dave w's Avatar
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    There are several ways to accomplish your wiring goals. A good first step would be to Identify and label the necessary wires. Be careful about wire colors, for example the fuel pump relay wire is usually green with a white stripe just like the AC wire is usually green with a white stripe. Skills reading schematics and skills using an OHM meter is a requirement, not optional.

    dave w

  2. #2
    Fuel Injected!
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    Hello Dave, thank you for warning me about colors, i assumed there isn't different color for every connection, all thaw they could have achieved it using shades and stripes like they do. Yes i am marking every wire, to see exactly what it is and where it's leading to, as well to see what i can throw away, like EGR for example, i have it closed with a plate, so no need wiring connection for it.
    But still quite confused, on the best way to merge my engine compartment wiring old and new together via C100 & C200/C273 between each other, for best configuration achievement...

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  4. #4
    Fuel Injected!
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    Thank you Dave, I have seen the video, a lot of info, i am as well signed up to the facebook group and have posted my pinout chart their, in case someone will find them useful, but i haven`t seen the pictures and read the comment from the "1999-2002 4.8L, 5.3L, 6.0L Harness Re-Work Step by Step" that you have provided a link to, will study, a lot of helpful info their. Thank you

  5. #5
    Fuel Injected!
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    Hi Dave, i lied, that`s not the video i have seen, this one has all the info i need basically, thank you very much!!!

  6. #6
    Fuel Injected!
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    Speedo question

    Few questions:
    - Does anyone know how do i wire speedo from 0411 pcm wire that gives 4K output: via VSS Lo or VSS Hi wire, or both toghether?
    Because the old type of speedo used to get the signal directly from the VSS sensor and transform it to 4k and then out of speedo to PCM/ECM as 4k pulses. But with the swap, the signal goes direct from sensor to PCM, PCM transforms it to 4k and out of the PCM. So where to wire it in the speedo, to wich wire/s???

    - Another question is my VSS sensor is located on my transfer case NP241C, will it function correct with 0411, or will i have to change it if someone knows?

    Thanks.
    Last edited by Aksl; 11-15-2018 at 05:10 PM.

  7. #7
    Fuel Injected!
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    VSS to PCM -> Speedo

    Ok, I found wiring scheme for speed signal DK_GRN wire coming out of C2 pin-50 connector of 0411 PCM.

    But my main question is can i wire this DK_GRN wire coming out of C2 pin-50 directly to C100 Bulkhead (VSS Hi -Yellow wire) that used to get direct signal from VSS sensor twisted together with PPL wire Low range signal (that i just ground), and entered through Bulkhead C100 connector -> DRAC -> Speedo, or do i have overpass the DRAC and wire it directly to speedo?
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