Question about Chevrolet Silverado 1500

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2006 chev 1500 Z71 once or twice a week in the morning after sitting all night it wont start.battery is dead.replaced bat.,alter.,ignit. switch.has been tested and nothing found.96000km.going on for 2 years.

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  • thomas2u Dec 27, 2008

    just put in new alternator 2 days ago.problem might occur twice a week,or once a month.

  • thomas2u Dec 27, 2008

    if problem is a short that only happens once in awhile how could I test for it?

  • thomas2u Dec 27, 2008

    this is a leased vehicle that is off warranty.(5 months left)would GM be on the hook for warranty if it was one of my warranty issues that werent fixed properly?

  • thomas2u Dec 27, 2008

    i'll look into that thanks tom g

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If you get a digital multimeter that measures AMPERAGE, you can test for current draw.
1s t- unhook the negative battery cable from the battery.
2nd - set your meter to Amperage (make sure test leads are in the correct position on the meter to measure amperage)
3rd - hook ONE test lead to the negative battery terminal, and hook the other lead to the negative battery terminal. You can secure it to the treminal with a zip-tie, or twist tie.
pull the fuse in the vehicle for the "dome light"
The meter will now be reading a number, something like .005 or so is acceptable, if it is reading something high like 1.23 or .150 amps, you need to simply go through the fuse box, and pull fuses one by one, while looking for the meter to drop as close to .000 as possible..If you remove a fuse, and there is NO change, be sure to put it back in. 
As an example: if you pulled the "cig lighter" fuse, and the numbers dropped fro 1.50 down to .005 then that tells you it is something in that particular circuit that is draining the power and killing your battery... Now all you have to do is look through the owners manual and find out what everything is that is connected to the "cig lighter" fuse, and I gaurantee ONE of them will be the culprit.
From there you will just have to isolate and repair the problem in the circuit, possibly a sticking relay somewhere etc....etc...
 I Hope this information helped!!!

Posted on Dec 27, 2008

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Check for bat draw by removing the pos cable and connect test light between pos cable and pos bat terminal if light is real bright there is a draw, remove fuses until light goes out.

Posted on Dec 27, 2008

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Check the speed sensor relay which I believe is covered by gm warranty give them a call I'm sure they will fix it for you

Posted on Dec 27, 2008

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Hi have the crankshaft positioning sensor checked it may be bad

Posted on Dec 27, 2008

  • ABHISHEK.C
    ABHISHEK.C Dec 27, 2008

    The starting problems may be a result of the passlock anti-theft system not operating properly.First make sure you have spark to the plugs, if you do move on to the fuel system. Check the fuel filter and even the pump. Turn the key on but don't crank. Do You hear the pump in the tank? if not you know the problem. If thats okay than check the filter. You may need a fuel line tool ( buy @ any auto parts store cheap). If all these check out, than you might have to put a scanner on it to determine if any electrical issue are causing your problem.



  • ABHISHEK.C
    ABHISHEK.C Dec 27, 2008

    the speed sensor relay (located on the gearbox) /check it.

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Hi and welcome to FixYa,

Initially, have you considered a possible alarm/security system?

Good luck and Thank you for using FixYa.

Posted on Dec 27, 2008

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Check all the connections properly u may be missing out some small junctions and connections which causes this as u say u hve replaced everything that is to be blamed.

Posted on Dec 27, 2008

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Each time it won't start the battery is dead? if so try disconnecting the alternator at night, there might be a defective diode that allows a small current drain and kills the battery.

Posted on Dec 27, 2008

  • 3 more comments 
  • yadayada
    yadayada Dec 27, 2008

    U need to try the solution before u rate it, oh well good luck.

  • yadayada
    yadayada Dec 27, 2008

    abhishek33, a speed sensor is not a realy, it is a small signal generator, nice try though.

  • yadayada
    yadayada Dec 27, 2008

    That is relay, not realy

  • yadayada
    yadayada Dec 27, 2008

    U did not answer the question about the battery being dead every time this no start happens, my solution is based on that assumption.

  • yadayada
    yadayada Dec 27, 2008

    the sensor is not covered, nor is it the problem.

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