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<blockquote data-quote="ejschultz" data-source="post: 6098888" data-attributes="member: 603800"><p>If the front and rear battery are not identical, I would recommend using a battery isolator. Having different batteries will cause the lives of both of them to be shortened. An isolator will fix this issue. I personally prefer diode type isolators. Solenoid isolators take up a little bit of current so they pose a little bit of a bigger load on your alternator. Diode isolators absorb a little bit of voltage, but not much (about .4 volts). Diode isolators are also much more dependable. Solenoids have about a 10,000 cycle life while diodes have essentially infinite lifespans, as long as you don&#039;t get them overly hot (hundreds of degrees). If the batteries are the same, run a run of positive and ground the rear battery to the chassis. If you get an alternator whine with it grounded to the chassis, run a ground up front. Also, a fuse will be needed within 18 inches of both batteries between the batteries. One of the pictures only had a fuse up by the front battery. If something up front shorts out, it&#039;s going to draw a lot of current from the rear battery too and all of your wire is going to burn up inside the car or wherever you put it, potentially starting a fire. Two fuses will protect you from this. Also, obviously fuse the power wire from the rear battery to the amp(s).</p></blockquote><p></p>

[QUOTE="ejschultz, post: 6098888, member: 603800"] If the front and rear battery are not identical, I would recommend using a battery isolator. Having different batteries will cause the lives of both of them to be shortened. An isolator will fix this issue. I personally prefer diode type isolators. Solenoid isolators take up a little bit of current so they pose a little bit of a bigger load on your alternator. Diode isolators absorb a little bit of voltage, but not much (about .4 volts). Diode isolators are also much more dependable. Solenoids have about a 10,000 cycle life while diodes have essentially infinite lifespans, as long as you don't get them overly hot (hundreds of degrees). If the batteries are the same, run a run of positive and ground the rear battery to the chassis. If you get an alternator whine with it grounded to the chassis, run a ground up front. Also, a fuse will be needed within 18 inches of both batteries between the batteries. One of the pictures only had a fuse up by the front battery. If something up front shorts out, it's going to draw a lot of current from the rear battery too and all of your wire is going to burn up inside the car or wherever you put it, potentially starting a fire. Two fuses will protect you from this. Also, obviously fuse the power wire from the rear battery to the amp(s). [/QUOTE]

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