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ALTERNATIVE FUSEBOX WIRING

 This wiring diagram shows an alteration to the existing fuse box wiring that was designed for someone specifically but is included here because it could be something of use to a number of people.

  The remit was that when the ignition was switched off all electrics, bar the ignition circuit, would automatically switch over to the aux battery through the existing fuse box, thus eradicating a second fuse box and extra wiring, and allowing radio etc to be used on site without fear of flattening the main battery, although please do note that if the radio is to be included in the system then both  +ve supplies must be connected together, hence the radio will not automatically switch off.

  The system uses a  switching relay [sometimes referred to as changeover relays] these are easily available from breakers or car parts outlets.