I am going to crank up the Jeep this week for the first time. I believe the starter was swapped to a 12v since there was a GM alternator wired up when i got the rig. But is there a way to tell it was 6v starter? OR does it matter much to run 12v in a 6v starter? The jeep is a 48, when did they go to 12v in the jeeps?