Quote:
Originally Posted by lilpoindexter
Has anyone rigged up a setup where one battery works when the car is shut off...so that even if you run that one down when the engine is off, you can still start the car with the other battery?
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That is typically the most common way of setting it up, either with a diode type isolator or with a relay. For example I run the stereo and trailer\camper plugs to the 2nd battery. I can run it down and still start the truck on the main battery. I personally prefer the diode type of isolator, but I'm sure there will be many opinions here as to what is best. In this situation, where you have very high current draw, it may be better for you to have your batteries hooked directly together to provide the amps to run the compressor. The only downside is that the batteries will discharge each other down when the truck is off.