SOURCE: audi tt quattro 180bhp2000 conv keeps looseing power
Faulty batteries are rare. Typically when battery won't stay charged an alternator is needed, but you can check for a current drain first. To do this you need an ammeter. Disconnect positive line of battery and connect the circuit "through" the ammeter instead. (DO NOT START THE CAR LIKE THIS!!!). Monitor current draw - as you do so, pull each fuse from fuse panel (left side of dash). Don't pull them all, but rather remove one at a time. When the ammeter shows minimal current drain you'll know which circuit is causing the draw. You can then disconnect individual loads on that curcuit until you find the culprit. Hopefully it's something easy like a light switch - but it could be more involved.
SOURCE: Battery keeps going dead. Especially
Does the fuel pump stay running at all like when you shut off the engine?
SOURCE: Battery light stays on
Many possibilities but the alternator is a good place to start, if its plug is loose, then the green relay inside the center console just to the left and slightly in front of the emergency brake will be clicking in connecting and disconnecting the battery( one loud click per time). It will need replacing or simply disconnecting works for the short budget.
SOURCE: Randomly won't start, happened after jumping dead battery
Probably the battery. Take it the chain auto parts place and they will test it for you.
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Did you wash the engine bay ?
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