hers on I cant figure out , have a old truck camper that i want to take to the races nothing fancy but it has its own battery for the water and lights and radio . other than installing a isolator is there a way to connect a 12 v wire from the truck to the camper battery and trickle charge the battery at like a 10 amp draw while driving. I know from experience that if the truck campers battery was realy low and you hook it up to the truck battery the current movement is excessive that it will either smoke the wire or continously blow fuses as it just pulls too much current. I am trying to figure out a way to keep the truck battery fresh so it will start but still be able to chrarge over to the camper battery without running a big cable to it.