Second Batt help

[dpu2014 10+ year member]

Ok i have a yellow top and have done the big 3 but I still need more power. My lights are basically strobe lights when i listen to some trivium. I need to add a second battery in the back so how do I do this? Do I just connect both my batteries at the positive terminal , then ground both of them or what? Do i need to mess with the big 3?

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[audiolife 5,000+ posts]

how much power are you running? what size is your yellow top?

 

[dpu2014 10+ year member]

kickerzx1000 watts

yellow top d34/78

 

[audiolife 5,000+ posts]

I would get my alt tested at autozone. If its ok check your grounds. If everything is ok I probbably would add a second yellow top to the back.

 

[dpu2014 10+ year member]

ok thanks

 

[loopkiller 10+ year member]

How old is the original Yellow that you already have? If it is over year old, you might want to consider buying 2 new batteries. Mixing old and new batteries is not a good thing to do.

 

[audiolife 5,000+ posts]

he can add a relay that might not be the "best way" but "should" work if everything is in working order. I am kind of suprised with that power he has dimming that bad.

 

[mustang76cnb 10+ year member]

Maybe a better alt won't have to replace as quicly as a batt.

 

[dpu2014 10+ year member]

Yea the dimming is awful. If I have the heat on then I can hardly listen to music. Either my alt. is shot or I have a loose ground. I just need to check it. My yellow top is 2 months old. But in the event that I will need to wire up another batt. How do i do it?

 

[mustang76cnb 10+ year member]

Power and ground to the second batt from the first one and fuse the positive cable.

 

[dpu2014 10+ year member]

So i want to ground my second batt. and connect the negative terminal from my first batt to the second?

 

[mustang76cnb 10+ year member]

two runs of wire one positive (fused) the other negative all from the first batt

 

[dpu2014 10+ year member]

two runs of wire one positive (fused) the other negative all from the first batt

dang im still not completely following this. Ok, connect the positives and negatives, then ground the batt in the back?

 

[mustang76cnb 10+ year member]

It uses the ground from the front battery terminal where you hookup the wire for it. It's like plugging a battery together making the two of them one by hooking the postive to the back batttery and the negative to the back battery from the first one you don't ground it to the car it's ground to the car from the first battery.

 

[loopkiller 10+ year member]