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  1. #1

    Default 2003 Chevy Silverado 1500HD Battery drain problem

    2003 chevy silverado 1500HD. Autozone says battery and alternator good. Battery drain issue. With current clamp around positive battery cable....truck turned off. Open and close truck door. Current pull is around .97 amp...stays like that until the cab lighting inside truck goes out...then the current spikes up to 3.67 amp draw. Drains battery and doesn't stop and will completely discharge battery. If I put a battery charger on, it shows a constant draw of 3.67 amps. What items can cause this? Autozone said the battery and alternator are good....the starter must also be good since it works and starts the truck. Is there a power module that could cause this type of problem? It's interesting that the cabin lights draw .97 amp...which you'd expect, and then when all lights on the truck are out, the current spikes up to 3.67 amps and stays at that level of drain. That's about 44 watts, so maybe I'll try to see if I can borrow someones IR to see if I can find something that shows a hot spot. Not sure how well that will work. Is there a power module that could cause this if it was defective? I enjoy working on my own truck, but this one may be a challenge.

  2. #2
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    I think your problem is referred to a "parasitic drain."

    If so....If you have an ampmeter or a test light hook it up & start pulling your fuses one at a time until the draw goes away. This will be the circuit that is draining your battery.
    Last edited by mfleetwood; 08-17-2011 at 09:50 AM.


    Mike (Denver, CO) - 2008 Sierra 1500 Z71 SLE 5.3L 4WD

    SUSPENSION: Rancho 4" Suspension Lift; Rancho RS9000XL Shocks; Rancho Skid Plates; Rancho MyRide Wireless Shock Controller;
    TIRES:
    BFG All Terrain KO 315/70/17
    DRIVE TRAIN: 4.56 Gears; Detroit TrueTrac Differential; True Cool 40k Transmission Cooler
    PERFORMANCE: DiableSport Predator Tuner; Custom Tuned by Diablew; Magnaflow Exhaust; AFE Cold Air Intake
    ELECTRONICS: Kenwood DNX6180 Touchscreen; Subthump box w/10" Kicker; Driver Information Center (DIC); Rear View Camera
    ACCESSORIES: Westin Brush/Grill Gaurd; Westin Nerf Bars; Truxedo Tonneau; 20% Tint; Tow Mirrors w/Heat & Signals

  3. #3

  4. #4
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    You're welcome....let us know how it goes.


    Mike (Denver, CO) - 2008 Sierra 1500 Z71 SLE 5.3L 4WD

    SUSPENSION: Rancho 4" Suspension Lift; Rancho RS9000XL Shocks; Rancho Skid Plates; Rancho MyRide Wireless Shock Controller;
    TIRES:
    BFG All Terrain KO 315/70/17
    DRIVE TRAIN: 4.56 Gears; Detroit TrueTrac Differential; True Cool 40k Transmission Cooler
    PERFORMANCE: DiableSport Predator Tuner; Custom Tuned by Diablew; Magnaflow Exhaust; AFE Cold Air Intake
    ELECTRONICS: Kenwood DNX6180 Touchscreen; Subthump box w/10" Kicker; Driver Information Center (DIC); Rear View Camera
    ACCESSORIES: Westin Brush/Grill Gaurd; Westin Nerf Bars; Truxedo Tonneau; 20% Tint; Tow Mirrors w/Heat & Signals

  5. #5

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    hey actually joined because of this post. Would love to hear the cause as mine is scheduled to go in to dealer Friday for fan relay and was going to get this checked.

  6. #6

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    Quote Originally Posted by cbgonefishing View Post
    hey actually joined because of this post. Would love to hear the cause as mine is scheduled to go in to dealer Friday for fan relay and was going to get this checked.
    Thanks for sharing, it's nice to know that so many people get so much value out of this site!

    Steve
    10 Chevy Traverse LT AWD
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    99 Chevy Cavalier LS (105K+ miles - commuter car)
    78 Chevy Suburban Silverado (454, 3/4 ton)
    62 GMC 3/4 ton Pickup (350 police interceptor)

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