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need a bigger alternator?

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=94525
Printed Date: May 10, 2025 at 10:38 PM


Topic: need a bigger alternator?

Posted By: wopaim
Subject: need a bigger alternator?
Date Posted: June 04, 2007 at 11:05 PM

ok guys i have an 03 dodge p/u with the HEMI.  my oem 136A alt. is making noise which i believe is the bearings going out and possibly result of stereo eating alt. over time.  so since i have audio amps totalling 1100 watts rms i was looking at putting a HO alt.  from looking around i have an option of a 160A alt.  that is only a difference of 24A.  i have no idea how much amps my truck draws running and with lights on, a/c on and all the other typical asseccories with an slt 1500. so i have'nt a clue how much head room my stock 136A alt currently has.  Is a 136A alt. already sufficient enough for me and how can i tell if i need a HO alt.?  i plan on replacing the stock battery with an optima (red or yellow top) probably the red top and also doing the big 3 wire upgrade.  will replacing stock battery to optima and doing the big 3 upgrade and the stock 136A alt. be enough?  i dont know a lot about this so please forgive me.  thank in advance.



Replies:

Posted By: loosingmymind
Date Posted: June 04, 2007 at 11:13 PM

How many Amps do your Amplifiers require? The big 3 will help you; but a deep cycle batt really wont. You should really look into a stinger or other brand H/O alt in my opinion. Hope this helps.

Dave



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David Fancher
USACi World Finals 2006
4th Place SQ PRO 601+




Posted By: wopaim
Date Posted: June 04, 2007 at 11:19 PM
well my mono amp says typical draw with music is 30A.  It doesnt say in the manual for my multi channel amp.  only that it requires a 50A fuse.  so i figured worse case 60A draw at peak to play it safe. 




Posted By: loosingmymind
Date Posted: June 04, 2007 at 11:55 PM

Yep. H/O will help your charging for shure.



-------------
David Fancher
USACi World Finals 2006
4th Place SQ PRO 601+





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