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    Adding second battery

    This is the correct way to wire up another battery right? Is the 2nd fuse necessary? I dont have the ground the second battery again, it will ground out through the other battery?




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    Re: Adding second battery

    Quote Originally Posted by Bobby32 View Post
    This is the correct way to wire up another battery right? Is the 2nd fuse necessary? I dont have the ground the second battery again, it will ground out through the other battery?
    2nd fuse is necessary. and i would also fuse the wire from the battery to the amp. i don't like un-fused pos wires. bad things happen to them



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    Re: Adding second battery

    Dont mean to thread jack but I have a question to.

    Do you need to have the same number of negative runs as you do positive? Ex. If I did 2 runs of Positive do I have to have 2 runs of Negative.



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    Re: Adding second battery

    Quote Originally Posted by Yellow20thAEGti View Post
    Dont mean to thread jack but I have a question to.

    Do you need to have the same number of negative runs as you do positive? Ex. If I did 2 runs of Positive do I have to have 2 runs of Negative.
    depends on how much power you are running. i only have the pos run and neg thru chassis. aka both batteries grounded to chassis so i have no neg run (for now).



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    Re: Adding second battery

    u dont have to run the ground to the back. this is the easiest and best way i have found to run my extra batts





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    Re: Adding second battery

    This is what I suspected since the negative is a ground. I guess my next question one be is it necessary to have as many grounds as you do positive runs to the second battery then.



    2003 20th AE VW GTi
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    Re: Adding second battery

    u dont need to run another ground. look at my pic. u only need a pos run and just ground the second batt to the chassis




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    Re: Adding second battery

    Quote Originally Posted by basscort2009 View Post
    u dont need to run another ground. look at my pic. u only need a pos run and just ground the second batt to the chassis
    So you are saying no matter how many positive runs I do to the second battery I will be fine with just grounding point for the second battery?



    2003 20th AE VW GTi
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    Re: Adding second battery

    yes just ground the back battery however many times u run a positive from the front, IE 4 runs of pos to the back battery, ground the back battery 4 times




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    Re: Adding second battery

    Quote Originally Posted by Yellow20thAEGti View Post
    So you are saying no matter how many positive runs I do to the second battery I will be fine with just grounding point for the second battery?
    it's debatable. it depends on how well your car conducts the electricity. personally, i say if you are 2-3k+watts i would go with a pos and a neg run between the batteries.



    1994 Thunderbird
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    Pioneer 6x8 3-ways (rear)
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    Alpine Type X 12" 2 cubes @ 30hz
    MTX 404 runs the inside
    MTX 1501d runs the X
    Optima G75/25 RT up front
    2x Optima G31 YT in the trunk
    200a EA HO Alt (1/0 Big 3)
    ALL MY WIRE IS WELDING CABLE
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    We're all feggots on the inside
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    Re: Adding second battery

    Quote Originally Posted by basscort2009 View Post
    yes just ground the back battery however many times u run a positive from the front, IE 4 runs of pos to the back battery, ground the back battery 4 times
    i dont think that is good advice. it depends on the resistance of the chassis.
    Last edited by jco1385; 07-02-2009 at 11:08 AM.



    1994 Thunderbird
    JVC KD-AV7010
    Alpine 6x9 3-ways
    Pioneer 6x8 3-ways (rear)
    JVC CH-X1500 12-disc MP3 Changer
    Alpine Type X 12" 2 cubes @ 30hz
    MTX 404 runs the inside
    MTX 1501d runs the X
    Optima G75/25 RT up front
    2x Optima G31 YT in the trunk
    200a EA HO Alt (1/0 Big 3)
    ALL MY WIRE IS WELDING CABLE
    Quote Originally Posted by Johnny Drama View Post
    I always knew I was a feggot.
    Quote Originally Posted by Rashaddd View Post
    We're all feggots on the inside
    Quote Originally Posted by ToledoTom View Post
    I am sure the administration will be having a few words with you when they catch wind of your language.
    DO NOT SEND ME ANYTHING USING UPS. I WILL NOT DEAL WITH THEM EVER AGAIN
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    Re: Adding second battery

    i have 2 batts and have had 1 run of each between the batts since day one.

    only problem is if i ground the amps to the rear battery i get huge alt whine... if not it disappears.



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    Re: Adding second battery

    Quote Originally Posted by jco1385 View Post
    i dont think that is good advise. it depends on the resistance of the chassis.
    Well how about 2 runs of positive and 1 negative run between batteries and ground the second battery to the chasis.



    2003 20th AE VW GTi
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    Re: Adding second battery

    they say u need a ground wire as big as a neg right??? ok well if u have 4 1/0 wires run back there for pos and only one 1/0 ground then what do u think is gonna happen....




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    Re: Adding second battery

    Quote Originally Posted by basscort2009 View Post
    they say u need a ground wire as big as a neg right??? ok well if u have 4 1/0 wires run back there for pos and only one 1/0 ground then what do u think is gonna happen....
    same = same

    and yes, you want them to be equal. thats why i wouldnt recommend upgrading to 2 runs pos and still running the neg thru chassis. that creates a bottle-neck. if you want to run one pos run, and ground to the chassis, that is (generally) ok. but more pos runs means you need more ground to complete the circuit. so (IMHO) if you run 2+ pos runs, you should do the same for the ground



    1994 Thunderbird
    JVC KD-AV7010
    Alpine 6x9 3-ways
    Pioneer 6x8 3-ways (rear)
    JVC CH-X1500 12-disc MP3 Changer
    Alpine Type X 12" 2 cubes @ 30hz
    MTX 404 runs the inside
    MTX 1501d runs the X
    Optima G75/25 RT up front
    2x Optima G31 YT in the trunk
    200a EA HO Alt (1/0 Big 3)
    ALL MY WIRE IS WELDING CABLE
    Quote Originally Posted by Johnny Drama View Post
    I always knew I was a feggot.
    Quote Originally Posted by Rashaddd View Post
    We're all feggots on the inside
    Quote Originally Posted by ToledoTom View Post
    I am sure the administration will be having a few words with you when they catch wind of your language.
    DO NOT SEND ME ANYTHING USING UPS. I WILL NOT DEAL WITH THEM EVER AGAIN
    OFFICIAL FEEDBACK THREAD

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