Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

elec gurus help

Discussion in 'The Garage' started by dheavychevy38, Sep 6, 2006.

  1. dheavychevy38

    dheavychevy38 1/2 ton status Premium Member

    Joined:
    Jan 6, 2003
    Posts:
    1,003
    Likes Received:
    1
    Location:
    Algonquin,illinois
    Ok we have a 03 2500 chevy hd with a 6.0 4x4. There is a major drain and we can't find it. The battery will be dead with in half an hour. The truck has a aftermarket stobe system and snow plow. Even if u un hook both of these just in case the battery still dies. One of the guys who is working on it said there is a 3 volt draw on it at all times. We unhooked the alt and the starter just in case and the same thing we need ideas please thanks Denny
     
  2. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

    Joined:
    Jun 13, 2003
    Posts:
    29,624
    Likes Received:
    1,380
    Location:
    Jersey Shore
    Disconnect the positive battery cable.. attach a test light between it and the battery post...

    if a draw is present it will light up.. pull fuses till the light goes out..that isolates the prob...
     
  3. readymix

    readymix 3/4 ton status

    Joined:
    May 30, 2004
    Posts:
    6,706
    Likes Received:
    26
    Location:
    Murrieta, California
    Ryoken is correct. And I hope your friend meant 3A draw not 3V....


    Just a FYI, the lamp under the hood will draw over 2A by itself so your problem could be smaller than you think.
     
  4. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

    Joined:
    Jun 13, 2003
    Posts:
    29,624
    Likes Received:
    1,380
    Location:
    Jersey Shore
    Yeah, I forgot to mention to him that you can check amp draw by using a meter instead of a testlight.... :doah: Most draws end up pulling 12v, it's how many amps that matters really...

    Had a trimtab pump drawing 38 amps to spin yesterday at work... :eek1: He wondered why it was tripping breakers... :doah: :haha:
     
  5. dheavychevy38

    dheavychevy38 1/2 ton status Premium Member

    Joined:
    Jan 6, 2003
    Posts:
    1,003
    Likes Received:
    1
    Location:
    Algonquin,illinois
    no light under the hood and we did the test light between the pos and the neg pulled out ever fuse and relay in or on the truck and the light never went out.
     
  6. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

    Joined:
    Jun 13, 2003
    Posts:
    29,624
    Likes Received:
    1,380
    Location:
    Jersey Shore
    Well, then you need to isolate it from the battery out, till you get the draw.. more than likely start down at the starter.. pull all the leads from the main post. reattach the battery lead.. then add the next, check, next, check, etc...
     
  7. dheavychevy38

    dheavychevy38 1/2 ton status Premium Member

    Joined:
    Jan 6, 2003
    Posts:
    1,003
    Likes Received:
    1
    Location:
    Algonquin,illinois
    gotcha we had the alt and the starter completely disconnected when we did the fuse and light test but we will have to try it with the meter on amps.Another advise will be great thanks for the infi guys
     
  8. twodollars

    twodollars Registered Member

    Joined:
    Jul 19, 2006
    Posts:
    49
    Likes Received:
    0
    Location:
    Wayne, MI
    Any aftermarket stereo or video stuff in the truck?? Might want to try disconnecting that.
     
  9. dheavychevy38

    dheavychevy38 1/2 ton status Premium Member

    Joined:
    Jan 6, 2003
    Posts:
    1,003
    Likes Received:
    1
    Location:
    Algonquin,illinois
    nope everything is stock other than the plow and the strobes which we disconnected
     
  10. sweetk30

    sweetk30 professional hooker Premium Member

    Joined:
    Nov 1, 2004
    Posts:
    25,549
    Likes Received:
    543
    Location:
    horseheads , ny 14845
    test light dont work on newer stuff to good at all for this. need amp meter to test. and it can be a pita!!!!

    you have time out body modules that are timed to turn off after certion times. some i have seen can take up to 1/2 hr to time out.

    dont forget also there is a door light button. need to deactivate that when pulling fuses. or dome light will get ya every time.

    that truck will have 2 fuse boxes. one in truck in comon spot. also one under hood.

    best find some real good info from a real shop book or take to a shop as the special order and times to let these body control thing time out can be real fun to figure out anymore.

    and you said you wanted that exrta stuff till it all goes bad. :doah:
     
  11. dheavychevy38

    dheavychevy38 1/2 ton status Premium Member

    Joined:
    Jan 6, 2003
    Posts:
    1,003
    Likes Received:
    1
    Location:
    Algonquin,illinois
    Chevy couldn't find the problem. The door was shut for the test. yes we pulled fuses from the inner one shut the door and waited a while because of the time issue but we only waited like 10 maybe 15 mins. We work at a shop but its a heavy eq shop mainly along with fabrication cause its for a concrete company. The main thing is i am not the greatest when it comes to wireing. I really appreciat all of the help.
     
  12. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

    Joined:
    Jun 13, 2003
    Posts:
    29,624
    Likes Received:
    1,380
    Location:
    Jersey Shore
    sheesh, didn't notice it was an 03..... :doah:

    I'd be guessing at this point.... not sure where the main systems are picking up power, whether its down at the starter or some feed off the battery...

    our older trucks, if you had the leads off the starter and alt, and still had the light going off, that'd be one funky prob cuz theres nothing else there.. :eek1: :doah: :haha: And pulling fuses wouldn't do anything, cuz you'd have no power to the fuse block...

    I would still employ the same tips tho.. disconnect EVERY lead off the battery... Then start testing each for a draw to try and narrow it down...
     
  13. dheavychevy38

    dheavychevy38 1/2 ton status Premium Member

    Joined:
    Jan 6, 2003
    Posts:
    1,003
    Likes Received:
    1
    Location:
    Algonquin,illinois
    Thanks guys today we are going to retest everything and hopefully we can find somethin i will keep u posted.
     
  14. dheavychevy38

    dheavychevy38 1/2 ton status Premium Member

    Joined:
    Jan 6, 2003
    Posts:
    1,003
    Likes Received:
    1
    Location:
    Algonquin,illinois
    What are some of the systems with the power moduel that u have to wait for so we have a idea thanks Denny
     
  15. diesel4me

    diesel4me 1 ton status Premium Member

    Joined:
    Jul 24, 2003
    Posts:
    17,577
    Likes Received:
    943
    Location:
    Massachussetts
    ideas...

    If its still drawing power enough to light a bulb or measure on the meter with ALL the fuses pulled,then its a short in the UN-fused wires,like battery cables,alternator or wires going into it,the "hot" wires the fusible links are in that go to the starter,etc..

    I've used a device that "detects" shorts,thats sold at parts stores--it has a meter and a "shunt",that you wave near suspected short curcuits,like in a door panel,etc..its needle will waver,and point to the short, when it goes near the short!..another mechanic I know uses an ordinary compass to do much the same thing!--but it'll point at speaker magnets too,so if you use this trick,dont be fooled!..:crazy:
     
  16. dheavychevy38

    dheavychevy38 1/2 ton status Premium Member

    Joined:
    Jan 6, 2003
    Posts:
    1,003
    Likes Received:
    1
    Location:
    Algonquin,illinois
    Ya we have come up with the following useing the method in a earlier post we came up with 1.50a when we pull the radio fuse it goes to .70a the if we pull the fuse for the info in the dash it drops to .20a but thats all we came up with. OH ya is u use your meter u can still run the power seat and other items we thought that was weird.
     
  17. diesel4me

    diesel4me 1 ton status Premium Member

    Joined:
    Jul 24, 2003
    Posts:
    17,577
    Likes Received:
    943
    Location:
    Massachussetts
    mmmm....

    Couldn't understand your last post fully--but if yanking the radio fuse drops the amount of drain,its likely part of the problem curcuit..I've had ciggarette lighters drain my battery before,I'd unplug that and ensure its not partially shorted!..I think they are "hot" all the time too!(and might be fused by the radio fuse?).....

    Also, I had one truck that for some strange reason,the HEI module was ' "drain" on the battery too--a test lamp would dimly glow ,until I pulled the pink wire off the HEI on the distributor cap!..there should not have been ANY juice there,with the key off!..never did figure that truck out--if I let it sit more than a week,the battery would go dead--so I took one cable off if I planned to not use it for that long,so it would start again!..:crazy:
     
  18. randy88k5

    randy88k5 1/2 ton status

    Joined:
    Nov 8, 2004
    Posts:
    1,248
    Likes Received:
    0
    Location:
    Lynchburg, VA, USA
    The radio is going to draw a small amount, usually about around an amp or so, to keep the radio presets and stuff.
     
  19. dheavychevy38

    dheavychevy38 1/2 ton status Premium Member

    Joined:
    Jan 6, 2003
    Posts:
    1,003
    Likes Received:
    1
    Location:
    Algonquin,illinois
    The problem with pulling the cable is it is a 03 chevy and is a daily driver shouldn't have to pull the cable every night it gets parked. The only 2 fuses that cause any change on the meter where the radio and icp which is the elec trip and stuff. Other than that everything else checked out ok.
     
  20. sweetk30

    sweetk30 professional hooker Premium Member

    Joined:
    Nov 1, 2004
    Posts:
    25,549
    Likes Received:
    543
    Location:
    horseheads , ny 14845
    stupid question. have you had the battery tested at a battery shop yet? might have a dead cell. or the life might just be gone in the battery. and dont buy a cheepy . get a name brand if you need a new one.
     

Share This Page