So I had the same problem in my car with the car charger. Funny as hell. 1981 911SC Targa. Never had a charge problem... But I never tried charging at night. Turns out the gauge lights and cigarette lighter are on the same circuit. Never had the lights on in the day. The gauge lightd pull enough power to drop the charger level down and kill it. I am hard wiring a 7805 +5 volt regulator chip to a separate fuse. It will put out 1 amp+ 1000 miliamps. No more BS. The 7805 is so cheap I don't know why they didn'y use it in the charger to begin with. I'm going to rig a 9v battery on one for emergencies.
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