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Thread: Guys Help...QUICK!

  1. 04-05-2007 06:23 PM #1
    redneck pimpin's Avatar
    redneck pimpin
    redneck pimpin is offline Member
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    I got my harness in from allen for Ls1 fans for my 02 Denali. I hooked it all up. and nothing happened. The blue wire that goes to the computer I took that out and touched it to the ground and both fans came on, so i know its not the harness. I still have my stock pcm, but I figuered it would just work. I am now being told it won't. I have orderd a Nelson tune and I am just waiting for it to get here. Now my other question is the green wire!! which one do I use?? I have a light green, dark green, and a light green with a white stripe.
    01 1500HD- STS Turbo, Meth kit, Nelson tuned, 10inch lift, 35's,
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    SOLD..02 GMC Denali Yukon- Lowered, Helo Maxx 20's, e-fans, Nelson Harness, Nelson tune, K&N intake


    SOLD!! 1995 GMC 5.7 350 with all bolt-ons, 9 inch lit, 35 inch tires, bushwacker cut out flares, 4:56 gears, detriot locker.
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  2. 04-11-2007 05:22 AM #2
    BlenderWizard
    BlenderWizard is offline Senior Member
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    <div class='quotetop'>QUOTE(redneck pimpin &#064; Apr 5 2007, 07&#58;23 PM) [snapback]88713[/snapback]</div>
    I got my harness in from allen for Ls1 fans for my 02 Denali. I hooked it all up. and nothing happened. The blue wire that goes to the computer I took that out and touched it to the ground and both fans came on, so i know its not the harness. I still have my stock pcm, but I figuered it would just work. I am now being told it won&#39;t. I have orderd a Nelson tune and I am just waiting for it to get here. Now my other question is the green wire&#33;&#33; which one do I use?? I have a light green, dark green, and a light green with a white stripe.
    [/b]

    IIRC, the dark green wire. I&#39;ll try to check later. I accidentally tapped the wrong wire my first time, and it basically just kept the fan running all the time.

    The PCM pin does have to be turned on. As you may have figured out, though, all the PCM does is ground the connection at the proper temp.

    2002 ECSB, Nelson Tune, LS1 electric fans, 145A alternator, K&N FIPK, 160º T-stat, TB coolant bypass, Corvette servo, 4 headlight mod, blue LED gauge cluster
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  3. 04-11-2007 07:43 AM #3
    RedHeartbeat
    RedHeartbeat is offline WTH JUST HAPPENED?
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    Gotta have the pins activated in the PCM or buy a controller for the electric fans to use the Nelson harness.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
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  4. 04-23-2007 11:41 PM #4
    Looney102
    Looney102 is offline Junior Member
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    well since i read this and as i&#39;m looking for fans at this time what is the easiest way to get the pin turned on for my 03 chevy??
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  5. 04-24-2007 07:50 AM #5
    RedHeartbeat
    RedHeartbeat is offline WTH JUST HAPPENED?
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    Get a tune&#33; Find a shop with HPTuners software and pay to have them turn the fans on. Get a tune while you&#39;re at it. If you can&#39;t find a local tuner contact the folks at NelsonPerformance.com and they can mail you a tune for a nominal fee.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
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  6. 05-19-2007 04:31 PM #6
    Silvey04
    Silvey04 is offline Junior Member
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    Yeah man, the PCM has to be tuned for the fans to come on. Allen will have to enable the fan for pin 42...you can call him and he will send a PCM in replacement for yours
    2004 Victory Red 5.3L RC/SB. Nelson Performance Tune, 180* Powerstat, Flex-a-Lite Electric Fans with Nelson Harness, aFe Stage 2 CAI, Granatelli CA-Tuned MAF, Flowmaster Muscle Truck Cat-Back (the one that kicks out in front of the rear tire), Shaved Ant. (thanks guys), New Toyo Open Country A/T&#39;s (use to have G/Y MT/R&#39;s), soon to have a 3&#39; Body Lift and Gibson Shorty Headers.

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  7. 05-19-2007 05:12 PM #7
    rubrhammer
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    So is that #42 on the blue or the red?
    Bob
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  8. 10-05-2007 10:51 AM #8
    N4cer
    N4cer is offline Junior Member
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    Guys, I did my fans yesterday. Still have questions:
    On the truck, I only use one pin, so does that mean that BOTH fans will come on? I can't have a high/low?
    Also, my tuner and I can't find why, but the fans are coming on with the truck, instead of waiting on temperature. Basically, the pin is grounded by default.
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