rossjools wrote: I once wired up a neighbour's 4x4 with a 3 position switch and 3 solenoids so that with the switch in one position the second battery was isolated from the main battery so it could be used at night for reading etc without flattening the vehicle battery. In one of the other positions the vehicle battery only was charged and in the third positon both batteries were being charged. When he started up in the morning he would switch to the main vehicle battery to make sure it was always getting a charge and always ready for service. After 20 minutes or so he would switch to the both position and both batteries would be getting a charge. He reported no problems with this set up until he sold the vehicle.
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Ross.
fishfinder wrote:I am wondering if I need to disconect the trailer battery from the converter while charging with the tow vehicle or doesn't make any difference.
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