hi, im new here and basically new to the sound system world..
currently I have 2 amps , 1 audiopipe 1500.1D and a JBL 1000.1, I have done the Big 3 and im running 4ga wire, I have 2 batteries installed today and I noticed something weird..
the store that made the installation installed a brand new interstate 800cca for the main battery since my old battery was weak,and a second AGM 755cca Deep cycle SP power battery as a second battery.
I was reading on how should this batteries be connected and came the parrallel, they are connected in parallel but I noticed that the installer put the 2 batt NEG- wire to the frame of the car not the the first (interstate) NEG- post, he did the POS+ of the second battery to the Interstate.
Is this a good way or i should connect the NEG- of the second Battery to the NEG- of the Interstate?
also, I noticed that after installing the second battery I have a CAP on the back and it showed 13.8v on idle not playing, and now after the second battery im looking 12.8v -13.1v not playing, this doesnt sounds good to me, I asked the installer why is this happening and he told me so BS that the Second battery had to be charged,thats why I was looking that voltage till the battery gets charged.
also I noticed also that both amps are grounded to bolts on the rear of the car and I was reading on a thread that they must be grounded to the battery itself!
So my concern is, should I connect both amps POS+/NEG- to each battery post directly? to which Battery?
also should I add a isolator? I will use the system mostly with the car off, If I should add a Isolator which cap I should buy?80amp,200,500 etc?
thanks in advance!