Question about 2005 Chevrolet Tahoe

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Have a 01 Tahoe with new red top and fairly new alternator. It charges at about 14v. But if I leave the Tahoe set for a week, it wont start.Where do I look for a voltage leak. The Tahoe seems to be working fine, nothing staying on. Where do I start.

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Start with the basics; Is the reason the car does not start is that the battery is discharged after a week of sitting or a case that it won't start without a jump although the battery is still good. If the car just does not start after sitting then try the following; Pull the negative battery cable and let the car sit overnight. Reconnect the cable in the morning and see if it starts. If it does then you are looking for something that is pulling current from the battery. Could be lots of things; light on in the glove box or trunk, a short in a wire, etc. You can try pulling a couple of fuses each evening and in the morning, replace the fuses and see if the car will start after sitting. If it continues to discharge the battery then try another set of fuses. The day it starts after sitting then you have narrowed the electrical system that is discharging your battery. Focus on those systems

Posted on Feb 21, 2010

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Posted on Jan 02, 2017

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I have a 01 Audi TT Quattro. Car wouldn't start with a fairly new battery. Once jumped it ran, shut off wouldn't start unless jumped. Replaced battery, worked for a week and the problem came back.


Put a multimeter across the battery and measure the voltage.. hopefully you get around 12.5V give or take..
Start the engine and check again, this time you are looking for around 14.2 - 14.6v
If you get less than 14v even if you rev it to 2000 rpm, then the alternator could be on it's way out.
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