battery isolator

This is completely new to me but there are 3 different ways of connectiong a battery isolator which is the correct one and why?

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The alternator is a 300 amp model the the rear battery is a group 31 yellow top the front battery is stock oem, the battery isolator  I am thining about is the stinger 200 amp model unless anyone else can sugest a better one or less expensive one.

2 of th amplifiers are aplphasonik pma1200da'a running at 2000 watts rms at 2 ohms and the third is an alphasonik pma4150, 4 x 150 watts

the third one is not correct...this would remove the alt. from the front batt. and images 1+2 look the same. this is the correct way......but dont forget to fuse both ends of the wire between the batteries. the starter relay disconnects the rear batt when the car is off.

XS