My CTEK MULTI US 3300 chargert cannot keep battery voltage high enough with the scanner enabled, receive msg. like"no communication with dashbord". Measured battery volts =11.9 when connection drops out. Battery is in good condition and otherwise works fine. cranking voltage is above 10.5. My conclusion is that the charger output is too low. Another charger (cheap) which claims to have 2/8/17A range also fails. Car is 2015 Audi S3.
Can someone recommend a charger/power supply that works. Thanks.
Can someone recommend a charger/power supply that works. Thanks.