Hi Omar,
I assume you want the original 12v battery that runs the car electrics, plus another 'auxillary' battery to run extras. Both to charge off the original alternator?
I use a solid state diode block to achieve this.
They're simple with no moving parts (like relays) to fail.
There are far more complicated and expensive (some would argue better) ways of doing it, but this works just fine for me.
Just make sure everything is properly rated for your alternator (100 amp would more than cover it i think. My 24 volt 60 series has an 80 amp alternator)
And make sure any additional cables are properly fused.
All the best
Sam
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