battery isolation

[ncc74656 2]

i have 2 batteries up front right now and plan to add some more wattage to my system. i am thinking of building a bracket ot hold a dedicated alt for 3 AGM's in the back and run 2 lead acid up front for the rest of the vehicle. however i wounder if this is necessary, is there a way to have 3 batteries in back and 2 in front with a single alt and have it setup for the stereo to only pull power from the rear battery bank and have no voltage drop/draw from the front 2 batteries for the rest of the car? i was thinking the only way to eliminate voltage drop to the factory electronics was to get a dedicated alternator and battery bank but i thought id ask here before installing 2 alternators.

[SpeakerBoy 64]

Not sure if you're really able to do a dual charging system with a single alt without an alt specifically built to do so, I've seen some 12v/16v HO alts

*I think I have. And if so, it would have been on this board that I saw it.

Edited February 23, 2014 by SpeakerBoy

[jonbearsmt 919]

an isolator only isolates when the car is off...   when its on its all connected...  the only way to have two separate systems is to have two different alternators ....

 

 

 why do you have to have separate systems anyhow?

[ncc74656 2]

currently i get a .6v drop at my amps but my computers get a 3v drop at times. i want to avoid issues with my computers and lights failing. also it would allow for more of the alternators output to go to my system as its no longer needed for the vehicle.

[SpeakerBoy 64]

Do you currently have a HO alt?

[ncc74656 2]

mechman 420

[SpeakerBoy 64]

What amps are you running?

Edited February 24, 2014 by SpeakerBoy

[ncc74656 2]

they are in my sig. i intend to run 2 KX2500.1's 1 KX650.4, 1 600.2 eclipse, and a sig processor of some kind.

[ncc74656 2]

i just had an idea. i pick up a .25 and .5F cap from a good brand (say rockford) and i place them in with diods for my factory power distro block and my after market distro block that i use for my head lights, computer programmer, fuel pump, ect. i add my extra batteries in the back and hook all my audio to that batter/distro block to that battery in the back. run 0ga from both front batteries to the back OR a 3/0ga wire run to the back from one of the batteries (wich ever works otu to tbe better). that would remove all the long wire runs through the cab, give smooth power to my trucks computers and prevent the amps from using the caps.

thoughts?

[lithium 358]

perhaps the power and ground to those components (computer) are poor? 

 

how are you monitoring that these drops are occurring? 

[ncc74656 2]

my computer programmer has a real time interface that displays voltages. the lights are easy as they visually dimm and then the PCM, ECM, and VP44 all have there own voltage monitor that displays min/max voltages for a trip.

[SpeakerBoy 64]

I'm on mobile. No sigs displayed

[lithium 358]

my computer programmer has a real time interface that displays voltages. the lights are easy as they visually dimm and then the PCM, ECM, and VP44 all have there own voltage monitor that displays min/max voltages for a trip.

 

how do you know they will be damaged? i'm not a car guy so is this a usual problem?