ok heres the deal, it started last winter in michigan, i noticed my volts would go from 14 to 11.5-12 when the engine idles. and if i dont drive the car every day the battery will drain and be dead, i take the battery to autozone and recharge it and then it works fine. all the lights dim as well,as soon as i give it gas the volts jump back up. do i have a relay problem? i do have gauges could one of the grounds for those be messed up? maybe a fuse? please help!