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lights dimming at WOT???

This is a discussion on lights dimming at WOT??? within the General Help forums, part of the LSx Technical Help Section category; iv noticed a little bit while im driving at night that the lights seem to dim and brighten back up ...

  1. #1
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    Arctic White
    1999 Z28 M6

    lights dimming at WOT???

    iv noticed a little bit while im driving at night that the lights seem to dim and brighten back up a little if i accellerate in 6th, also the battery gauge will drop down and back up, not much but just maybe from like 14.5 to 13. tonight though i was driving home just messing around and from a stop i eased out in 1st then once in second i took it up to about 5 grand under wot and noticed my lights dimmed dramaticly so i took my foot of the gas and threw the clutch in and my lights went bright again. the gauge was comin up from about 12.5 by the time i got to looking at it........ anybody know what the fuck is goin on with my power supply or is this a normal thing i have never noticed???
    1999 Z28, SLP Flow Pack, SLP 85mm MAF, AIR Temp Modual, Taylor 8.5 wires, NGK55 plugs, FRA! Skip Shift Elemenated, Lou's Short Stick, SLP Subrame Connectors, KYB AGX's, EGR Removed, MagnaFlow Catback, 3" cut out. STOCK DYNO ... 308 RWHP 319 RWTQ

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    Member Fedge's Avatar
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    Black
    1998 Trans Am M6

    i'm having a similar problem...I saw on another thread that the tensioner may be the culprit, but I don't know how to test it for improper operation, I mean it seems ok to me
    the other thing would be the alternator...
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  3. #3
    Necction
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    From what Ive seen its a pretty common problem. Mine does it too.

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    Black
    1999 Corvette

    yep i have a 99 vette that does that, but my interior lights also pulse, so i get my alternator checked and they say that its bad, so i get a new one put on, but it still does it!

  5. #5
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    Arctic White
    1999 Z28 M6

    yea i was gonna say, i just had my alt. die like 3 months ago and i have a brand new one so that cant be the prob, im gonna check more into that tensioner belt idea, ill have it checked out and if they say something is wrong then ill get it replaced and ill let you guys kno what happens...... anyone else have any other ideas?

  6. #6
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    ok thanks, i think that might be it too, because my tensioner belt is sqealing

  7. #7
    Senior Member 02z28ls1's Avatar
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    navy blue
    2002 Z-28 Camaro M6

    Your tensioner may be weak,I imagine there is a spec for how much belt tension should be there. But I've also seen where people claim there is a tendency for the serp belt to go wacky at higher rpms. There is an aftermarket belt tensioner that doesn't work with spring tension,but is set and tightened down and reduces the tendency to throw belts and other problems. But it definetly has the symptoms of classic alternator belt slipping.

  8. #8
    Member Pitchlock's Avatar
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    My friend had to get a new tensioner and it fixed everything. Not to be mixed up with the light flash that happens every few times under normal driving
    99 Z28
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  9. #9
    Senior Member Redphoenix1998's Avatar
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    RED
    1998 Pontiac Trans AM

    Check the tensioner, if you have more than 1/4" freplay on the belt then it's bad. Also, the setting on the tensionor should be on the II mark. There is a I, II, and III mark. The squealing is from the bearing in the tensionor pulley, just take off the bolt and grease the bearing.

  10. #10
    Senior Member Redphoenix1998's Avatar
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    RED
    1998 Pontiac Trans AM

    Also check your belt for glazing cause it may be slipping at WOT as well.

  11. #11
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    Mine doesnt do it at WOT, it just does it all the time

  12. #12
    Member jbb6811's Avatar
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    blue,blue
    00 z-28 m6, 06 H3

    mine too............

    and it doesn't have to be wot. i work 2nd so its dark every day when i leave and it blinks in all gears not just one.! but this weekend i'm going to top off the blinker fluid. that could be it!
    LS7 clutch,01 slave,Corsa 3" stainless exhuast,drilled/slotted rotors + ceramic pads,160 thermo,Mti clear lid,msd 8.5 wires & Ngk plugs...more to come!
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  13. #13
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    Quote Originally Posted by jbb6811
    and it doesn't have to be wot. i work 2nd so its dark every day when i leave and it blinks in all gears not just one.! but this weekend i'm going to top off the blinker fluid. that could be it!
    Blinker Fluid! LOL thats funny

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