Hi all,
After leaving my car for half a day or overnight I am receiving the following message on my stereo display.
"12v Battery Almost Drained, Switching Infotainment System Off'
However I don't think that the battery is actually draining? I've seen @DV52 post the below warning a couple times. which brings me to my question :
Am I understanding correctly that if you do not ground to earth, then the vehicles systems as a whole might be under the impression that the battery is undercharged even though it is properly charged? At one point I used the CTEK + and - clamps directly to the batteries + and - poles, rather than grounding - to the frame. Could that explain the infotainment system thinking otherwise, and if that's the case how do you retrain the system?
Otherwise - totally plausible - I have another issue that I don't know yet - maybe the battery is dying for example. But when I checked the voltage after allowing it to rest overnight it only went from 12.98v to 12.96v
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After leaving my car for half a day or overnight I am receiving the following message on my stereo display.
"12v Battery Almost Drained, Switching Infotainment System Off'
However I don't think that the battery is actually draining? I've seen @DV52 post the below warning a couple times. which brings me to my question :
Am I understanding correctly that if you do not ground to earth, then the vehicles systems as a whole might be under the impression that the battery is undercharged even though it is properly charged? At one point I used the CTEK + and - clamps directly to the batteries + and - poles, rather than grounding - to the frame. Could that explain the infotainment system thinking otherwise, and if that's the case how do you retrain the system?
Otherwise - totally plausible - I have another issue that I don't know yet - maybe the battery is dying for example. But when I checked the voltage after allowing it to rest overnight it only went from 12.98v to 12.96v
_________________________________________________
allroads: Need to be real careful when hooking-up any sort of battery charger on a mk7.
Most (all?) mk7s have a battery monitor which sits on the negative terminal of the battery (see pic below), The purpose of the battery monitor (it's part of the power supply LIN bus) is (amongst other roles) to keep a history of the electrical current that is used/inputted) to/from the battery. It provides most of the basic data for the calculation of what VEW calls the System Voltage. System voltage (not battery voltage) is what the control modules use when making decisions related to the vehicle's rail-volts.
Anyhow, it's important when charging a mk7 to INCLUDE the battery monitor in the charging circuit. This means that battery chargers should not be connected directly across the battery (i.e. positive-to-positive and negative-to-negative)
The correct way to charge a mk7 is to hook the positive lead of the charger to the battery positive and the negative lead to a naked engine both (not to the negative battery terminal). If this isn't done the battery monitor is by-passed and the charging current is never recorded!
Don