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I use a battery isolator in my setup, however mine is very expensive. I use a Xantrex Pathmaker. Since I sometimes have a camper on my truck i needed to be able the isolate 3 separate battery banks. Anyway, this is a solenoid relay type isolator which produces no voltage drop. A cheaper diode based isolator is gonna drop the voltage down .7 volts, which may or may not be a factor for you. I know that the hellroaring is a good unit. Search for soleniod isolators maybe you can find a simple cheap one. Just be sure to get one that can handles the amount of amps that your alternator can produce. I personally think that if you can squeeze an extra deepcell battery in your car its by far the best tank solution. I survive my cranks and can run my carputer with the car off for hours on end with no probs.
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