dual batteries in off-road vehicles
I am currently adding a second battery in parrallel to my electrical system in preperation for a winch and lightbar. Charging both batteries simultaneously will be a large draw on the alternator and I am scared to overload it and damage/break it.
Anyone know how I can do this? I have thought of keeping the second battery on standby (not functioning) unless I needed the extra CCA for winch operation. Also I have installed a battery isolation switch allowing each one of the batteries to be operated seperately, in parallel, or disconnected entirely from the electrical system of the vehicle.
A friend mentioned the use of an in-line resistor coming off the pos (+) leg of the alternator to ensure that it is never overloaded.
I'd appreciate any tips you all might have regarding this project, preferably from someone who has done it before. I know it's not everyday. Thanks.