Apologies if this has been covered, I have searched but not found a definitive answer. When I start my car (96 GT Auto) the volt meter bounces up and down and the headlights, interior and dash lights flicker. Whilst this is happening the revs are dipping in time with the lights. This happens for about 1 or 2 minutes then goes back to normal. The battery measures 12.64V in off. When I start the car it bounces from 12.5 to 13.6 ish volts. During this time the battery light is on the dash. When the revs, lights etc settle the battery reads about 14volts. The car will then run fine until the next cold start. Any ideas on what I could check or look at please?