Volt gadge mystery
Im having an odd problem with the volt meter on my 1999 sse bonnevillewheni start the car ( and it doesnt matter if its hot or cold ) the gaudge slowly goes up to its normal operating leverl, 14, once warm it goes to the middle which is 12 i belive, if i turn onto a street or parking lot the meter drops to the red side of the meter and things dim out, once the car started to stutter and almost stalled out on me. This also happens when there is no accessroies on.
Hear is what ive done, checked positive and negitive battery cables from the battery to the ground and alt, checked the boots on both cables by taking them off. installed a brand new battery, installed brand new belt, installed brand new alt, did a meter test on the alt from the alt , when starting the car the meter shows it hanging at 11.6 volts then going to 13.8
any advice or a solution ? id hate to ship it to the auction since this car is one of the nicest ive owned in many years many thanks in advance