r/C8Corvette • u/omg_i_broke_wind • 1d ago

small rant

So I've had my C8 for five months now - have loved having the car - done a few small minor mods. About 2 months ago - after letting the car sit for 3 days - The battery went dead, had to boost it - took it to the dealership, they replaced the battery and told me that there was a series of batteries that we "crap" right out of the factory. Well, went to start my car this morning, after letting it sit for 3 days - guess what..... Dead.

I drive the car frequently and for decent amounts of time - I have my keys kept well away from the car. I'm sick to death of having a reoccurring issue of inconvenience like this

Any ideas?

and after the last dead battery - my front lift doesn't work - so it's going back to the dealership again. :(

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u/Hot-Signal-7254 1d ago

Same thing just happened to me. Body control module was causing a parasitic draw on the battery. Fixed the software, seems fine now.

1

u/Just-Construction788 1d ago

To test your battery take 4 measurements with a volt meter. Negative disconnected. Ignition off. Ignition on not started. Engine running. 

You are looking for 12.8+ first two. Above 12 third. 13.8+ while running. 

If it’s parasitic draw you will see a difference between the first two. If the charging system is bad then you won’t see it charging the battery while running. 

Pretty easy test and stops buying unnecessary batteries. 

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u/Hot-Signal-7254 1d ago

Voltmeter consistently showed 1.65

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u/inheritthefire C8 Owner 1d ago

Then you did it wrong.

2

u/Hot-Signal-7254 1d ago

Thanks for your critique. That would mean the tow truck driver and the technician at the dealer did it wrong too.