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You say that the car was running fine before you adjusted the third brush in the generator to give you more amps for night driving. It sounds to me that you have shorted out something in the generator, because, the car is starting and running until you turn the lights on. If you have a weakness in your battery and the genny is shorted out and NOT charging, then turning on the lights might just kill whatever charge is in the battery.
I would take the battery to a supplier and ask them to load test it for you. They can tell you if there is a weak cell or a problem with the battery. Then check whatever you did to the genny to make sure none of the wires are shorted and that all the brushes are contacting the armature.
Viv.