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06-17-2016, 09:17 AM #1
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- Jun 2016
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- USA
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- 9
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.
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06-17-2016, 12:19 PM #2
- Join Date
- Feb 2009
- Location
- Florida Man Status Acheivement
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- 11,785
Navy Blue Metallic- 98 T/A, 00 FBVert, 78T/A
You've got something draining the battery.
Do you have an aftermarket stereo, amp or some other device plugged in?
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06-17-2016, 12:52 PM #3
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- Jun 2016
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- USA
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- 9
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06-17-2016, 02:09 PM #4
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- Jun 2016
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- USA
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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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06-18-2016, 07:49 AM #5
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- Jun 2016
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- USA
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- 9
I just tested with the test light & no change to the test light's light on any fuse being pulled.
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06-18-2016, 02:07 PM #6
- Join Date
- Sep 2013
- Location
- pa
- Posts
- 38
black- 2004 gto
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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06-18-2016, 02:24 PM #7
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- Jun 2016
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- USA
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- 9
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06-19-2016, 06:59 AM #8
- Join Date
- Jun 2016
- Location
- USA
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- 9
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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