With only one extra battery(in the back), should I...

[kowboy 10+ year member]

run my 1/0 straight from the main batt. under the hood(kinetik hc1800)to it, or straight from the alternator(iraggi 300 amp)? Is there even a difference?

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[audiolife 5,000+ posts]

best sure shot way to hook up 2 batteries is + to + and - to - on the batteries with 0 guage with fuses within 18" of each battery. some people will argue you can ground to the back but that is dependant on a few things like how the body is on the frame and if its a uni body... you can try in the back but if you run into problems in keeping the back charged (and if the alt is able to keep up well) more than likely hooking it up the way im talking about it a good fix. only real draw back to it is cost performance will be as good as it gets though

 

[kowboy 10+ year member]

Thanx. It is grounded in the back, but the + is going straight to the front battery, and NOT the alternator. I had seen others go straight to the alternator, but I wasn't sure what the advantage was of doing it that way(if any).

 

[jeepintn 10+ year member]

Thanx. It is grounded in the back, but the + is going straight to the front battery, and NOT the alternator. I had seen others go straight to the alternator, but I wasn't sure what the advantage was of doing it that way(if any).

well, with a group 31 yt up front and 2 more in the back, i was having some voltage drop issues with it grounded in the back, i just bought some kicker 1/0 to run to ground the back batteries in parallel with the front ones to see if that helps any, ill let u knowwhat i discover

 

[kowboy 10+ year member]

well, with a group 31 yt up front and 2 more in the back, i was having some voltage drop issues with it grounded in the back, i just bought some kicker 1/0 to run to ground the back batteries in parallel with the front ones to see if that helps any, ill let u knowwhat i discover

werd.

 

[NX2000DET 10+ year member]

did you put a fuse on the + wire that runs to the rear battery?

 

[kowboy 10+ year member]

did you put a fuse on the + wire that runs to the rear battery?

yes. two of 'em.

 

[2loud4u 10+ year member]

did you put a fuse on the + wire that runs to the rear battery?

There should be 2 fuses on the wire from the battery in the front to the battery in the back.

 

[NX2000DET 10+ year member]

There should be 2 fuses on the wire from the battery in the front to the battery in the back.

why should there be two fuses going to the rear battery coming from the front battery?

 

[audiolife 5,000+ posts]

within 18" of both batteries that way if you get a short it doesnt start a fire

 

[helotaxi 5,000+ posts]

They both store a ton of current. If there is a short between them as mentioned a single fuse will only protect from current from one of the batteries. The other will freely dump its load and overload the wire possibly starting a fire.