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Thread: Factory Gauge Harness Wiring Diagram

  1. #1
    Enjoying Life Chief Hunglikmule 70-K5's Avatar
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    Factory Gauge Harness Wiring Diagram

    Using your factory wiring can be a simple way to get a signal to your new gauge without running wires into your engine compartment. After you take out the instrument panel you will see the rectangular harness has numbers located at each wire.

    By following the printed circuit very carefully I came up with the following identification and explanation of each wires function.

    The first list is from an 86 K5.

    1. Brights
    2. Gauge lights
    3. Volts
    4. Volts
    5. Oil Pressure
    6. Keyed ignition
    7. Clock
    8. Clock
    9. Water Temp
    10. Ground
    11. Left turn signal
    12. Right turn signal
    13. Seat Belt
    14. 4wd
    15. Choke
    16. Acc power
    17. Brake
    18. Fuel gauge


    It has come to our attention that this is not universal, MrK5 traced the harness for an 84 CUCV, he came up with:


    1. Bright indicator
    2. Dash illumination lights
    3. Oil Pressure low light
    4. 4x4 indicator
    5. Ground for dash lights on the left
    6. Alternator #2 (truck had 2 alternators)
    7. Also goes to Alternator #2 - ground maybe
    8. Alternator #1
    9. Ground for lights
    10. Left turn indicator
    11. Right turn indicator
    12. Ground
    13. Light below speedo, left side - mine had no bulb installed
    14. Light below speedo, right side - mine had no bulb installed
    15. Light below fuel level, left side - coolant temp warning
    16. Also light below fuel level, left side
    17. Light below fuel level, right side - Low Coolant
    18. Fuel Gauge


    The only two that we came up with that are the same are #1, #2 and #18.

    Found this in reference to my plug as it was a CUCV military blazer:

    Last edited by MrK5; 06-20-2011 at 09:08 PM.

  2. #2
    Knows their $hit MrK5's Avatar
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    Man this is AWESOME! You just saved me a lot of work! Thank you very much!
    ~Scott

    New project: 89 C3500 crewcab

    "The General" 84 K5 with some upgrades

    Blazer Bash on CK5B
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  3. #3
    Knows their $hit MrK5's Avatar
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    Just had a thought. My truck had just a panic light for the oil pressure. Do you suppose it is the same position on the plug whether it is a gauge or a light? Because I think you only get one or the other from the factory so it would make sense it's the same number either way.
    ~Scott

    New project: 89 C3500 crewcab

    "The General" 84 K5 with some upgrades

    Blazer Bash on CK5B
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  4. #4
    a.k.a. Wes Mantooth Knows their $hit triumphrider74's Avatar
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    Thumbs up

    This should be a sticky.

    Ya know, so we don't lose it.

    1990 Silverado Blazer / 379Ci, 6.2L diesel / 33x12.50's
    My Build Thread: http://www.chevyk5blazer.com/forums/...o-Diesel-Build

  5. #5
    Knows their $hit MrK5's Avatar
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    Well shoot, I went ahead and verified and mine is different. At least I know about the numbering, because that really helps. Here's how mine was laid out:

    1984 Chevy K5 military CUCV M1009
    1. Bright indicator
    2. Dash illumination lights
    3. Oil Pressure low light
    4. 4x4 indicator
    5. Ground for dash lights on the left
    6. Alternator #2 (truck had 2 alternators)
    7. Also goes to Alternator #2 - ground maybe
    8. Alternator #1
    9. Ground for lights
    10. Left turn indicator
    11. Right turn indicator
    12. Ground
    13. Light below speedo, left side - mine had no bulb installed
    14. Light below speedo, right side - mine had no bulb installed
    15. Light below fuel level, left side - coolant temp warning
    16. Also light below fuel level, left side
    17. Light below fuel level, right side - Low Coolant
    18. Fuel Gauge
    ~Scott

    New project: 89 C3500 crewcab

    "The General" 84 K5 with some upgrades

    Blazer Bash on CK5B
    Blazer Bash website

  6. #6
    Enjoying Life Chief Hunglikmule 70-K5's Avatar
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    Well I guess the brights, dash lights and fuel gauge are similar from 86 civilian gas to 84 CUCV...

    When I wired up my custom gauges I cut the wires off that I was going to use with enough of a tail left over to identify where it came from on the harness plug, just in case I had to re-wire... I capped the unused wires and then taped around the plug so nothing could ground itself out.

  7. #7
    Knows their $hit MrK5's Avatar
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    Quote Originally Posted by 70-K5 View Post
    Well I guess the brights, dash lights and fuel gauge are similar from 86 civilian gas to 84 CUCV...

    When I wired up my custom gauges I cut the wires off that I was going to use with enough of a tail left over to identify where it came from on the harness plug, just in case I had to re-wire... I capped the unused wires and then taped around the plug so nothing could ground itself out.
    Sounds like a good idea! I will do the same.

    Do you think we should merge your first post and my numbering so people are aware there may be a difference?
    ~Scott

    New project: 89 C3500 crewcab

    "The General" 84 K5 with some upgrades

    Blazer Bash on CK5B
    Blazer Bash website

  8. #8
    Enjoying Life Chief Hunglikmule 70-K5's Avatar
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    Done...

  9. #9
    Knows their $hit MrK5's Avatar
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    Just updated the first post with better information for my plug.
    ~Scott

    New project: 89 C3500 crewcab

    "The General" 84 K5 with some upgrades

    Blazer Bash on CK5B
    Blazer Bash website

  10. #10
    Enjoying Life Chief Hunglikmule 70-K5's Avatar
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    that's Professional quality right there...

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