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My son has a 2012 Beetle. he had to get a jump start a few weeks ago last week he said it was not starting right away. Today it will not start and never had a warning light come up. All the dash lights just flicker rapidly while you try to crank it with the push button. Any suggestions or experiences how this happened or how to fix it would be appreciated
 

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Has he gotten the charging system checked? Could just be a bad battery.
 

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Is the starter turning over fine, not turning over or is it turning over and just not starting? If the charging system is testing ok; meaning the battery and alternator are fine, then you might scan for trouble codes, go from there.
 

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Battery was showing 5 volts replaced it and it started fine but the interior lights and radio are not acting properly now it has a battery light on and after 3 days it wont turn over.. could the original jump start a few weeks ago damaged something? once it started i pulled the NB Cable and it did not die so the alternator is good right?
 

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Well, much is a open question; I would have the whole charging system tested, most auto parts stores will do this for free, these days. That way, you can confirm; that the battery and alternator are good, then you can move on to other possible issues.
 

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You need a cheap multimeter, Walmart, Home Depot, less than $30. You tube how to use it if you don’t know.

Never disconnect the battery while the car is running.

With the multimeter, car not running you should get about 12.5-12.7 on the battery just sitting in your driveway. After starting the car at the top of the battery you should be reading 13.8-14.3.
If it’s not your alternator is dead.
 

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Likely a battery. This is where you need a multimeter, then you can easily verify if the battery is bad.
Multimeter wouldn’t tell you anything but voltage. A battery can show correct voltage but not capable of any amount of amperage that could even run a light. Load tester is what they would need.
 

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If yo
Battery was showing 5 volts replaced it and it started fine but the interior lights and radio are not acting properly now it has a battery light on and after 3 days it wont turn over.. could the original jump start a few weeks ago damaged something? once it started i pulled the NB Cable and it did not die so the alternator is good right?
if you pulled the battery cable and it remained running. The alternator is most likely fine. You could slowly turn on accessories like wipers and such.If it remains running without battery and those items are running, I’d say it’sgood enough to not acres you over anytime soon. It still could be weak (some cooked diodes (less current producing)). Either way, I need some cheesecake
 

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With a multimeter you check the battery with the car not running. Anything below 12.2 and the car will start somewhat hard when the weather is warm and usually not at all once it gets cold. If you want to load test the battery have a helper turn the key while you watch the multimeter if the reading goes below 10.6 or 10.8 you battery is getting weak.

If you installed a new battery just a few days ago and its dead now then the chances of your alternator being bad are pretty good. To test it put the red multimeter lead on the stud on back of the alternator where the battery cable connects, black lead to the battery ground. It should read 13.8-14.3 anything less for extended periods of time and your alternator is just not keeping up with the electrical demands of your car. Be careful of moving parts.

Again, never disconnect a battery with the car running.
 

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I found this with a quick google search. From this website.


WARNING:
Some day a well meaning mechanic or naive jump start specialist will attempt to disconnect your battery with the engine running. If you value your car and your money, don't let him!
The man from the road service thinks he's being helpful. After he can't jump start your car, he puts in his own known good battery and starts your car. So far so good -- your battery was definitely either run down or bad, and he's proven it.

Now he decides to "test" your alternator by disconnecting the battery. After all, the car's ignition should be able to run on just the alternator's power alone.

Wrong!

The moment he disconnects either lead from your battery, it's entirely possible he caused thousands of dollars in damage. Here's why...

Your battery does more than just provide electricity. It also shorts AC, spikes and transients to ground. Removing the battery from the circuit allows those spikes and transients to travel around, endangering every semiconductor circuit in your car. The ECU, the speed sensitive steering, the memory seat adjustments, the cruise control, and even the car's stereo.
 
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