2007 Silverado - NO POWER - Help

Discussion in 'GM Electrical Tech' started by coachg08, Mar 26, 2013.

  1. coachg08

    coachg08 New Member

    2007 NWBS EXT CAB Silverado z-71 4.8L 63k miles

    Ok so this morning i stopped as usual to get my coffee. Came out and went to crank truck and it wouldnt turn over on first try. Did it again and it started up but i noticed my clock on radio went back to 12:00 like the battery had just been reset. Pulled into work, shut truck off, and opened doors -- dome lights did not come on but my radio lights were still on with the door open and key out. I shut the door and attempted to lock with the key fob. Nothing. Opened door and tried hitting the lock button - nothing. Radio lights still on. Put key in the ignition to try and start - nothing but the radio lights went out. I went into work, confused. Came out this afternoon and tried jumping it - nothing. Battery is three months old and was AC DELCO top of the line whatever it was. Before I disconnected both terminals I felt the negative terminal and it was hot. I went under the truck and and disconnected the ground to the frame and cleaned it. Disconnected ground to the engine block and brushed it off and put it back on. Put the positive terminal to the battery back on and then the negative terminal. Horn started going off. Put the key in the ignition and it started -- all electrical was working. I let it run for about 15minutes and shut it off. Went to turn it back on and it was dead. No lights, no chimes, no nothing. Repeated the steps i did earlier to get it to start. Nothing. I checked some fuses and they all looked fine. Pulled some relays but i dont know how to tell if one of them is bad. Could this be a faulty ignition start switch? Any advice or help would be greatly appreciated! I have never come across something like this! Ive never had ANY problems what so ever! The truck has no power and i cant pull any codes. Is there a way to some how get power where i can check a code?
  2. RayVoy

    RayVoy Epic Member 5+ Years 5000 Posts

    The battery appears to be "dead". You may need to remove and have it recharged. While your at it, have it tested (it wouldn't be the first new battery to fail after a very short time).

    If the battery post is hot, there is probably resistance. A good clean connection does not heat, a dirty/corroded connection will.

    You may have a failed battery, you might have a bad ground cable, you might have something else. The first thing you need to do is make sure the starting point (battery) is good.
  3. coachg08

    coachg08 New Member

    I just had the battery checked and it is good, volts all check out. I was able to get some power by just connecting jumper cables to the positive and negative cables from my truck to a buddies. The truck wouldnt turn over when i tried to crank it and then it went dead again. Reconnected the cables to the battery and had power again. This time i connected the hand held to see what codes would come up - none, came out clean. Tried to crank and nothing. Complete dead again with no lights no nothing. Im at a loss for words. I have no idea what could be causing this. When they installed the battery, they put that anti corrosive goo on there and the connection is clean as a whistle. The positive and negative cables all seem tight and nothing loose. WTH!!!

    - - - Updated - - -

    If it was a bad ground cable, is there any way i can test for this?
  4. coachg08

    coachg08 New Member

    So I cleaned off all 3 of the ground connection sites and still nothing. I put a DMM on the positive and neg of the battery and i get 12.4. When I leave the positive end of DMM on the positive and try to touch the engine block where the ground is, it drops to 5.5. Any metal i touch it drops to around the same. Any ideas?
  5. RayVoy

    RayVoy Epic Member 5+ Years 5000 Posts

    Indicates a pretty good battery.

    Indicates a bad ground (a very bad ground).

    You say the battery end is clean, try checking the other end of the ground cable.

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