i ahev a 94 integra gsr and starting yesterday whenever the car is at idle the battery light comes on. what does this mean? im pretty sure it means the battery isn't charging up but not sure. replaced teh battery already and it's not that but after turning the car off wouldn't start jumped it and if the car gets below 2000 rpm the tach stops wroking all electronics shut off and then the engine dies anyone know what this is i was thinking alternator but not sure any help is welcome