Auxiliary second battery project complete.. Second battery in boot supports all systems when ignition off, main starting battery for starting/running isolated when ignition off, reconnects when ignition on via a 200amp relay, original heavy duty cable direct to starter still in place, only the system connection isolated, so ZERO drain on main starting battery, both charge with split charging wiring when running, and 13.9 lovely volts. Fitted a digital voltmeter in place of analogue clock, which I've kept, as android head unit has Internet time aligned display in any case.. Second battery connected with an 80amp resettable trip in-line to protect vehicle loom...
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