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If the car sits overnight/several hrs, it won't crank!!

This is a discussion on If the car sits overnight/several hrs, it won't crank!! within the General Help forums, part of the LSx Technical Help Section category; I thought it was a simple bad battery. Had old battery tested & it would not take a charge. Fine, ...

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    If the car sits overnight/several hrs, it won't crank!!

    I thought it was a simple bad battery. Had old battery tested & it would not take a charge. Fine, replaced that with new & good to go for a couple days. Then it starts not even cranking if it sits overnight or so. Sometimes the gauges also go crazy when I'm trying to start the car.

    I then replace the alternator & I am still having the issue. I swapped the relays under the hood & that changed nothing. I checked all fuses as well. I also pulled the starter relay & jumped that. Starter works fine. I disconnected the negative cable from the battery hoping that would solve things for now, but nope! Dead the next day again.

    I can get it started again every time with either a jump or charging the battery, but it will go right back to not cranking the next day.

    What should be causing this? It's an LS1 f-body fyi.

  2. #2
    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
    98 T/A w/a little mods...

    You've got something draining the battery.


    Do you have an aftermarket stereo, amp or some other device plugged in?

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    Quote Originally Posted by SMWS6TA View Post
    You've got something draining the battery.


    Do you have an aftermarket stereo, amp or some other device plugged in?
    That's what I figured, but where do I start? factory amp. Aftermarket speakers & head unit. Head unit is wired with the proper harness like I have done for years. Speakers are wired to stock wiring.

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    I just did a parasitic draw test & the whole time my meter was reading around 12.4. So that can't be right. At any rate, I pulled every fuse & none of them made any difference to the meter reading.

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    I just tested with the test light & no change to the test light's light on any fuse being pulled.

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    If the car sits overnight/several hrs, it won't crank!!

    If you disconnected the negative terminal and the battery still went dead you have another bad battery. There is no way for the car to drain the battery if it is disconnected.

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    Quote Originally Posted by douglowden116 View Post
    If you disconnected the negative terminal and the battery still went dead you have another bad battery. There is no way for the car to drain the battery if it is disconnected.
    Yesterday I disconnected both the negative & positive cables from the battery. Hooked it back up today & it started right up so the new battery is not the problem.

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    I tried testing for parasitic draw today with a non-LED test light & it now looks like I do not have a draw at all. The test light lights initially & then quickly goes out. I did verify the light is working properly as well.

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