OK, so the in laws bought a 2006 TT and the invertor has issues. It will not charge the battery or run the 12VDC lights, even when on shore power. If you hook up a battery charger to the battery all...
I am not sure I understand what is working? If you charge up the battery with your external charger, do all your 12 volt lights work after removing the charger? Also, when you say all the fuses are OK do you include the two on the converter?
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