Alternator size ?

gastang · 01-10-2007, 02:58 PM

What size alternator do any of you recommend for me. I want to hookup one JL Audio 300/4 Amp ( front and rear speakers ) and one JL Audio 1000/1 amp ( two 10w7's in trunk ). I believe thats a total of 1300 watts. This is going in a 65 Mustang without airconditioning, power windows , locks , etc... Thank You!!

XC-C30 · 01-10-2007, 03:12 PM

what size are your amp's internal fuses? what size is your stock alt?

mulletboy2 · 01-10-2007, 03:26 PM

Are you going for SQ/SPL/Streetbass, are you planning on competing and if so, at what level?

If it's just for a personal system rather than competition, I'd say stick with standard and see how it works out.. uprate the battery/stock wiring first as it's a lot cheaper. If you still have a reason to want to upgrade the alternator later, you can do so..

Also, be aware that a 150A aftermarket alternator isn't necessarily better than a 100A stock one.. if the stock one puts out 80% of its current at idle and the 150A one only puts out 50% at idle, you'll probably find the OE one is better in practise (and OE ones usually have a higher output ratio at idle than aftermarket ones, although not always).

HTH

Mark

gastang · 01-10-2007, 03:30 PM

not sure about interal fuse but:

In the back of the owners manual it says:

for the 1000/1 amp - General specifications Recommended fuse value 100a
recommended fuse type ANL

for the 300/4 amp - General specifications Recommended fuse value 40a
recommended fuse type AGU or Maxifuse

I have a 100 amp alternator I was going to use but not sure if its big enough. The stock one I am sure is to small something like 60amp.

hope this helps.

gastang · 01-10-2007, 03:36 PM

Just for personal use, no competitions. SQ not SPL.

Quote: Originally Posted by mulletboy2

Are you going for SQ/SPL/Streetbass, are you planning on competing and if so, at what level?

If it's just for a personal system rather than competition, I'd say stick with standard and see how it works out.. uprate the battery/stock wiring first as it's a lot cheaper. If you still have a reason to want to upgrade the alternator later, you can do so..

Also, be aware that a 150A aftermarket alternator isn't necessarily better than a 100A stock one.. if the stock one puts out 80% of its current at idle and the 150A one only puts out 50% at idle, you'll probably find the OE one is better in practise (and OE ones usually have a higher output ratio at idle than aftermarket ones, although not always).

HTH

Mark

Spawn12336 · 01-10-2007, 03:44 PM

I'd find out what your currenct Alt puts out. Are your lights dimming when the bass hits? if so then you pretty much need a new alternator. Adding a second battery or capacitor is a band aid solution to the problem, but not a solution.

XC-C30 · 01-10-2007, 03:59 PM

doesn't make any difference if you're going to compete or not..... the output won't change.... so I wouldn't know why anyone would ask..... you could do with your stock alt. search for "big 3" on the forum here. I'd start with that before looking onto an other alt. If you're eperiencing any trouble after you're sure all wiring is correct, THAN upgrade to a bigger alt.

edit: If you already have the 100amp alt lying around, you could use thhat one... do the big 3with that one and you should be fine for sure!

gastang · 01-10-2007, 05:38 PM

Thank You very much, I will give the 100 amp alternator try and do the big 3.

Thanks again, Kevin

Quote: Originally Posted by IC-C30

doesn't make any difference if you're going to compete or not..... the output won't change.... so I wouldn't know why anyone would ask..... you could do with your stock alt. search for "big 3" on the forum here. I'd start with that before looking onto an other alt. If you're eperiencing any trouble after you're sure all wiring is correct, THAN upgrade to a bigger alt.

edit: If you already have the 100amp alt lying around, you could use thhat one... do the big 3with that one and you should be fine for sure!

david69leonard · 01-11-2007, 09:29 AM

A two farad cap will definately do the trick, however with that old of a vehicle a bigger alternator will help, i would also throw in a Redtop Optima or equivalent battery...

"Its not the size of the alternator that counts, its how well you work it"

-David69Leonard-

Quote of the day

XC-C30 · 01-11-2007, 10:42 AM

unfortunatly you're totally wrong......

strohj · 01-11-2007, 10:44 AM

I have a 120A alternator that works perfectly fine for me... I am running a 800w kenwood amp to my sub and a 600w/4 to my components...

on top of that I also have my full carpc in there...

sdashiki · 01-11-2007, 10:46 AM

Quote: Originally Posted by IC-C30

unfortunatly you're totally wrong......

nice to not finish, but still complain.

strohj · 01-11-2007, 10:50 AM

Quote: Originally Posted by david69leonard

A two farad cap will definately do the trick, however with that old of a vehicle a bigger alternator will help, i would also throw in a Redtop Optima or equivalent battery...

"Its not the size of the alternator that counts, its how well you work it"

-David69Leonard-

Quote of the day

that will stop the lights from dimming.. however... if he continually draws more current than the alternator is providing he is just running down his battery.. which is his real concern...

so umm the size of the alternator DOES count

XC-C30 · 01-11-2007, 11:07 AM

Quote: Originally Posted by david69leonard

A two farad cap will definately do the trick, however with that old of a vehicle a bigger alternator will help, i would also throw in a Redtop Optima or equivalent battery...

"Its not the size of the alternator that counts, its how well you work it"

-David69Leonard-

Quote of the day

1. The meaning of a cap has been discussed numerous times, but here we go...

It will stop your lights from dimming, IF your alt comes to short only just... If your alt is far too small a cap won't do **** for you. However, a cap COULD be usefull to take out the ripple in your cirquit, but that's only if the rest of your wiring is ok.

2. throwing in an extra battery, wether it is a redtop (NOT, cause that's a battery with a big STARTUP capacity, so pretty useless in an install, cause you're not getting full potential.) or a yellowtop (more likely), or something else, won't help you either, unless you're in competition and you use it as backup, apart from your main battery. If your alt is too small already, why would you even try to push it to load an EXTRA battery???

3. your ending is worthless and just so you could throw in something to act like you know.... Boy your a n00b who doesn't know what you are talking about!!! There's nothing more important than the size of your alt and good wiring! If your alt is too small you simply won't cut it, and no, there's no way to make it act bigger.... You are not in control of what your alt does.... so you cant make it do anything else than what it does.... You CAN'T "work it" as you say.....

strohj · 01-11-2007, 11:09 AM

Quote: Originally Posted by gastang

not sure about interal fuse but:

In the back of the owners manual it says:

for the 1000/1 amp - General specifications Recommended fuse value 100a
recommended fuse type ANL

for the 300/4 amp - General specifications Recommended fuse value 40a
recommended fuse type AGU or Maxifuse

I have a 100 amp alternator I was going to use but not sure if its big enough. The stock one I am sure is to small something like 60amp.

hope this helps.

try the 100a alternator and see.. its fairly easy to replace a alternator later on on your car...

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