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<blockquote data-quote="lincolnls" data-source="post: 2437158" data-attributes="member: 570773">if you are running a second battery in the rear you are going to need more then 4 gugae wire.option 1)you should run atleast 1 0guage + and 1 )guage - fromt he front battery to the rear battery, i ran 4 runs total of 0guage to the rear, the idea is to get resistance down as much as possible.option 2)same as above but add&nbsp; a relay on the positive.this is so that when the car is off (engine not running) and you play your stereo you could run the battery dead but when you go to start your car it will as the stereo was only running on 1 batteryas far as the ground is considered you can run a ground from the rear battery to&nbsp; ground in that back, it will work.ground the battery in the rear has its down falls thou, for one ideally you want all your car gear to be grounded at the same point to prevent a ground loop. another one is that you can lower resistance on the - though a pair of 0guage then you would if you just chasis&nbsp; ground the batterybottom line is use atleast 1 0 guage run of +&nbsp; and 1 0 gugae run of -</blockquote>

[QUOTE="lincolnls, post: 2437158, member: 570773"] if you are running a second battery in the rear you are going to need more then 4 gugae wire. option 1) you should run atleast 1 0guage + and 1 )guage - fromt he front battery to the rear battery, i ran 4 runs total of 0guage to the rear, the idea is to get resistance down as much as possible. option 2) same as above but add a relay on the positive. this is so that when the car is off (engine not running) and you play your stereo you could run the battery dead but when you go to start your car it will as the stereo was only running on 1 battery as far as the ground is considered you can run a ground from the rear battery to ground in that back, it will work. ground the battery in the rear has its down falls thou, for one ideally you want all your car gear to be grounded at the same point to prevent a ground loop. another one is that you can lower resistance on the - though a pair of 0guage then you would if you just chasis ground the battery bottom line is use atleast 1 0 guage run of + and 1 0 gugae run of - [/QUOTE]

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