I just posted this on the MJOC forum:
Is this similar to the RedArc?? Have a look at a picture of the RedArc on Ebay or do a search.
If so, it is a simple process - I've jut installed one in my Navara work ute.
Run a battery cable from the positive terminal of your existing battery to the terminal at the front of the isolator - on the RedArc, this is thge terminal on top closest to the LED light.
Run another battery cable fom the remaining terminal to the positive terminal on your auxiliary battery. Run an earth lead from your aux battery negative terminal to earth on your vehicle - the body usually.
Now, the solenoid should allow power to be used from the starting battery until the voltage of that battery drops to around 12.6 volts, when the starting battery is isolated and power is only used from the aux battery.
When the engine is started, the starting battery is charged first, and once the voltage reaches around 13.5, the solenoid closes and the aux battery is also charged - on the RedArc an LED light comes on showing that both batteries are charging.
See how you go...
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