First of all, z-man, I used the search feature . I have done my homework, and it seems that a Grand Cherokee fan(s) is what I want to go with due to lower amp draw/cfms, etc. However, I run a 1200w amp with dual 12in Alpine Type-Rs that dim headlights. I have in the mail, two 2 gauge wires for the connection from the batt to the alt, and batt to the chassis to help with this. I'm wondering if I should up the alt to the 200A on ebay, just to be safe if I'm bumpin' some jams, blowin' A/C, and the fan(s) decide to kick on when it's 100 degrees outside.

EDIT: running the 136A currently

 

I don't think that would hurt you any....... Just your amp at full volume is going to be pushing your current alternator....... (although, I would like to think you don't always have it maxed out.....)

 

Sounds like one for yes. I agree. The fuse for the amp is 125A. lol.

 

If you don't have one, a farad cap. will help also. I'd look at the bigger alt., bigger battery, and the cap..

 

go big on all wiring and alternator too.

maybe consider a dual battery setup like RV's where the alternator charges both batteries but the electronics can only drain one and then preserve the other for the engine, starter, pcm. i don't know if this is possible in our trucks or not but it sounds good.

 

Very possible. And a very good idea too...... (I bet with the engine off, that stereo can suck the battery dry damn quick. Yes, this is my 240 horsepower generator for my stereo, it conveniently moves the stereo around too.......)

 

I'm gonna see how quick one day when I'm at the farm with our instant starter at 3/4 volume.

 

it won't take long to drain the battery with that big amp. and be aware that draining a regular battery all the way down will kill it.

consider using a deep cycle marine battery. match the size, shape, amps, etc and it's design can tolerate drain down and recharge. they can also be cheaper - which makes no sense.

 

Ehh it should last a little while, I have two tens with a 1000w amp and I've ran it on only the battery for over an hour. The truck turned over slowly but it did start. It was on pretty loud because I was washing the boat next to the truck. Had to give the battery a good charging after that though lol

 

Marine battery's don't last as long, could be the circumstances. Because we got four years out of ours and the boat mechanic was surprised how long it lasted (maybe he was trying to sell us something to preserve them)