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<blockquote data-quote="loopkiller" data-source="post: 5725097" data-attributes="member: 601690">First thing first, those two HC1400 (if good and fully charged) should be able to keep your voltage above 12.0v by themselves with that system. Now you either have some dead batteries, a bad alt, bad wiring, or a combo platter of the above.Here is what I suggest:Step 1) Remove the NEG- wires from each battery, one at a time, and check the voltage. This will tell you the true voltage of the battery. You should have the car and audio off for this test. Simply do this for both batteries and let us know the voltage.Step 2) Have your alt tested at Autozone or whatever local auto parts store you have close to you. They will gladly test it for free. Just drive it over there and ask them nicely.Step 3) Make sure you inspect all of your wiring. Your diagram was way too small to be able to read, but it looked like you did not have a dedicated ground wire between the batteries. That may be part of the problem. I would highly recommend that you add that permanent ground wire from the front NEG- post to the rear NEG- post. You should add this to your current wiring. Do not remove the ground to chassis if you already have that. Also, your amps should ground directly to the rear battery NEG- post and not to the chassis.Step 4) Come back here with your findings in the first two steps. We will be able to help you more after that.</blockquote>

[QUOTE="loopkiller, post: 5725097, member: 601690"] First thing first, those two HC1400 (if good and fully charged) should be able to keep your voltage above 12.0v by themselves with that system. Now you either have some dead batteries, a bad alt, bad wiring, or a combo platter of the above. Here is what I suggest: Step 1) Remove the NEG- wires from each battery, one at a time, and check the voltage. This will tell you the true voltage of the battery. You should have the car and audio off for this test. Simply do this for both batteries and let us know the voltage. Step 2) Have your alt tested at Autozone or whatever local auto parts store you have close to you. They will gladly test it for free. Just drive it over there and ask them nicely. Step 3) Make sure you inspect all of your wiring. Your diagram was way too small to be able to read, but it looked like you did not have a dedicated ground wire between the batteries. That may be part of the problem. I would highly recommend that you add that permanent ground wire from the front NEG- post to the rear NEG- post. You should add this to your current wiring. Do not remove the ground to chassis if you already have that. Also, your amps should ground directly to the rear battery NEG- post and not to the chassis. Step 4) Come back here with your findings in the first two steps. We will be able to help you more after that. [/QUOTE]

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