i'm hopen after the switch both batteries will read 14.2. not sure if this will effet the voltage but i'm running a 250 amp fuse at the front bat and right before the rear batt i have a 175 amp fuse. he ran out of the bigger fuses and usen this til he gets more in. then i'll do 2 300 amp fuses for the batt. and use the 250 for the rear batt to amp