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Thread: Tahoe E Fan Problem! Help

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  1. 03-08-2010 10:19 AM #1
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    99LS1
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    Tahoe E Fan Problem! Help

    I have a Tahoe e-fan set up in my 99 Sierra RCSB with the relay's from Nelson. They have been in the truck for obout a year and a half with no problems. Now I am getting a 2 amp drop when the fan kicks on in defrost setting. My battery is also not starting the truck over night.

    I have a 100 monthe diehard gold battery that was installed in May of 2008. The battery charges back up fine.

    Could I need a bigger altonator so the charging system can keep up?

    Maybe do I have an issue with my Nelson e-fan harnes?

    What amps are the stock altonators?

    Thanks in advance. Mark
    1999 GMC Sierra SLE sc sb 4.8l 4L60E, Comp 1.75 roller rockers, graniaelli maf, garneaelli wires, Aem brute force intake, BBK 80mm tb, Nelson tune, 2/4 drop, Denali rims, custom grill, Denalli guages, Edelbrock IAS shocks, Tahoe E-fans, Nelson harness, and tune, McGaughy's 2" drop spindles, New matched coil springs, Air Lift rear lowerd air bag kit, Air Lift wireless remote

    List of things to do
    4.10 gears and a new posi, Lt headers, Cam, Heads, Intake,
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  2. 03-08-2010 10:23 AM #2
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    timber74wolf
    timber74wolf is offline timber74wolf
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    Have you had the battery and the alternator checked? I would start there 1st.
    2014 GMC Sierra Crew Cab
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  3. 03-08-2010 10:29 AM #3
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    99LS1
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    I am going to do that today. Thanks for the response.
    1999 GMC Sierra SLE sc sb 4.8l 4L60E, Comp 1.75 roller rockers, graniaelli maf, garneaelli wires, Aem brute force intake, BBK 80mm tb, Nelson tune, 2/4 drop, Denali rims, custom grill, Denalli guages, Edelbrock IAS shocks, Tahoe E-fans, Nelson harness, and tune, McGaughy's 2" drop spindles, New matched coil springs, Air Lift rear lowerd air bag kit, Air Lift wireless remote

    List of things to do
    4.10 gears and a new posi, Lt headers, Cam, Heads, Intake,
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  4. 03-08-2010 10:49 AM #4
    PitchBlackC3's Avatar
    PitchBlackC3
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    How are you measuring a 2 amp drop?
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  5. 03-08-2010 10:52 AM #5
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    99LS1
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    When the fan kicks on my guage is droping down to 12 at idle. when I am driving down the road and the fan kicks on the lights dim and the truck feels like it stumbles.
    1999 GMC Sierra SLE sc sb 4.8l 4L60E, Comp 1.75 roller rockers, graniaelli maf, garneaelli wires, Aem brute force intake, BBK 80mm tb, Nelson tune, 2/4 drop, Denali rims, custom grill, Denalli guages, Edelbrock IAS shocks, Tahoe E-fans, Nelson harness, and tune, McGaughy's 2" drop spindles, New matched coil springs, Air Lift rear lowerd air bag kit, Air Lift wireless remote

    List of things to do
    4.10 gears and a new posi, Lt headers, Cam, Heads, Intake,
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  6. 03-08-2010 10:55 AM #6
    PitchBlackC3's Avatar
    PitchBlackC3
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    That's voltage, not amperage.
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  7. 03-08-2010 11:04 AM #7
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    99LS1
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    Sorry I meant 2 volt drop.
    1999 GMC Sierra SLE sc sb 4.8l 4L60E, Comp 1.75 roller rockers, graniaelli maf, garneaelli wires, Aem brute force intake, BBK 80mm tb, Nelson tune, 2/4 drop, Denali rims, custom grill, Denalli guages, Edelbrock IAS shocks, Tahoe E-fans, Nelson harness, and tune, McGaughy's 2" drop spindles, New matched coil springs, Air Lift rear lowerd air bag kit, Air Lift wireless remote

    List of things to do
    4.10 gears and a new posi, Lt headers, Cam, Heads, Intake,
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  8. 03-08-2010 11:05 AM #8
    PitchBlackC3's Avatar
    PitchBlackC3
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    Does your battery, allow you to check the water? Could be low. Otherwise the battery is toast, trade it in.
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  9. 03-08-2010 11:55 AM #9
    RedHeartbeat
    RedHeartbeat is offline WTH JUST HAPPENED?
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    It may not be the fans of battery but the ABS module motor stuck "on". Those modules are notorious for that and will drain your battery overnight.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
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