1000-1500 watts?

[09civic 5,000+ posts]

will i need a new alt? lets sat the stock alt is 70...can i use the stock alt with the big 3 and 1 or 2 batts? and 1000-1500 watts daily

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[SmartAsss 10+ year member]

Yes, No.

My truck has a 140amp alt and it barely runs 800w at idle.

 

[lil98cabrio 10+ year member]

no i tried with my 85 amp alt, it didnt like it

 

[09civic 5,000+ posts]

Yes, No.
My truck has a 140amp alt and it barely runs 800w at idle.

what other electrical is upgraded?

 

[Mitch86 5,000+ posts]

I'm going to guess yes, you will need a bigger alt

 

[Ineed$ 10+ year member]

Try it and see what your voltage drops to,then decide

 

[SmartAsss 10+ year member]

I have the ground wires the "big 2" if you will, I have a feeling this will turn into an argument of why id don't have the alt wire. (don't get me started, please)

The basic problem will be the idle output of any alternator. its not the same as what the alternator's rating is. its much lower, about half.

My system is just fine when im driving and have the alternator rev'd up. but at idle with the lights on and system up, I do have voltage drop.

My truck probably uses something like 60-70 amps just to run its own electrical needs not including my system..

your vehicle will probably pull half of what your alternator is rated. that would leave like 35 amps to power a system. that would only leave room for a little over 500w of stereo equipment. (thats only considering your alternator is reved up) if you exceed that then you will have voltage drop, which causes your alternator to heat-up and eventually fail if it happens enough.