A common problem in the #Audi #A4B8 is low battery charging voltage, this is due to oxidation and deterioration of the contact in the cable that goes from the generator to the starter and to the positive terminal under the hood.
In my case, the battery comes to 14.65V, while the positive terminal under the hood is 14.73 V. It is recommended to measure the voltage under full load of the on-board network (light, heating, fan included). If, with the engine running, less than 14V comes to the battery terminals in the trunk, then it is worth thinking about repairs, many lay an additional 25mm2 power cable from the generator to the plus terminal and this solves problems with low battery charge
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I also checked the leakage quiescent current - after arming, the current is about 150mA, and I have no problems with self-discharge of the battery on A4
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Timecodes:
0:00 Start, what are the problems
1:13 Switching on the load (light, heating)
1:31 Voltage at the terminals under the hood
2:11 Battery terminal voltage
2:28 Leakage quiescent current measurement
4:16 Results
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Негізгі бет Автокөліктер мен көлік құралдары Checking the charging voltage Audi A4 B8 battery (eng sub)
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