ok so i have 2 12 kicker cvr 1000 rms jl amp now i have to add a second battery into my blazer problem is the only place i have room is the back where the subs are it needs to be vented is there a spot i can use that is already there i was thinking right at the rear break lights just making a special attachment to go there and vent need some help here guys

 

well in my blazer i have the same year as yours i pulled the peice to cover your cargo spot and took out the jack and i installed my battery right there and it worked perfectly i wish i had pictures it was hidden so perfect.

 

that is wher i was looking but i need to find a way to vent it directly to the outside it is a full size battery the draw my system has is massive how did you solve this problem for the venting

 

are you talking about adding a regular car battery as your secondary?

have you looked into doing the big 3 upgrade? a high output alternator? a larger under hood battery?

if yes to all those and still having issues, get a sealed agm battery for the back because they don't need to vent, they can be mounted any way except upside down and have more reserve than a regular acid filled battery than can spill inside your nice truck

 

ive spilled acid in the back on mine. not pretty

 

i have a ho alternator already and i have upgraded my wireing already so its time to add a second batt and i did it already i found a gromet under the plastic surrounding your back hatch and have a costom made box for the batt to sit in if it does spill it wont go anywhere and its totally sealed

 

the only reason i ask is because i had a JL 1000/1, 300/4 and 300/2 in my truck before i sold it with the big 3, 145 amp alternator and an upgraded under hood battery and never had voltage drop lower than 13.6 when sitting at idle with the brakes and headlights on.

good luck