Electrical Problems! Chassis Battery / Alternator Issues.

Will the headlights and other things run at the same time when the engine is running at a fast idle? If not then I would think the alternator is bad. What type of reading are you getting at the starting battery with the engine running at fast idle? should be in the 14volt range. When you get it working right look into a trik-L-start and it will keep the start battery charged when the house battery is being charged by the converter.