H.O. alternators?
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=67446
Printed Date: May 03, 2024 at 1:56 PM
Topic: H.O. alternators?
Posted By: shaggy_one469
Subject: H.O. alternators?
Date Posted: December 01, 2005 at 8:17 PM
is it ok to run a HO alternator that puts out a lot more amps than you need? i am currently running an MTX 81000d pushing 2 audiobahn 12's in a factory bandpass box. i drive a 92 rodeo and i believe the stock alternator only puts out 100 amps. the amp requires a 150 or 160 amp fuse so i assume my alternator must put out at least that much. as it is now, when the bass hits, the display on my HU dims almost to the point of being completely out. i know i need an HO alternator but will it be ok to run one that is more than whats needed? i am planning on upgrading my subs and adding another matching amp so i will need an alt. that will not only support one of these amps but two plus a small amp for the mids and highs. any help would be appreciated.
Replies:
Posted By: shaggy_one469
Date Posted: December 01, 2005 at 8:21 PM
i meant to mention that the dimming that goes on is with the gain at about half.
Posted By: geepherder
Date Posted: December 01, 2005 at 9:18 PM
Absolutely. There's nothing wrong with running an alternator capable of more power than needed. Do us a favor and don't play it so hard until you do the upgrade. Also do a search on the big 3 and setting gain controls.
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My ex once told me I have a perfect face for radio.
Posted By: dwarren
Date Posted: December 01, 2005 at 9:45 PM
Another benefit of having a larger alternator is future upgrades. You may find your self looking for a four channel amp or other accessories. Not to mention that if it all possible, avoid getting an alternator that just cuts the power requirements. Getting a larger alternator will prolong the life of the alternator by causing it less stress. It's like haivng a more powerful amp that enables more headroom. -------------
Posted By: shaggy_one469
Date Posted: December 01, 2005 at 9:52 PM
ok so if i am understanding correctly, a 200 amp alt. is capable of putting out 200 amps but only does so when needed?
Posted By: dwarren
Date Posted: December 01, 2005 at 10:02 PM
shaggy_one469 wrote:
ok so if i am understanding correctly, a 200 amp alt. is capable of putting out 200 amps but only does so when needed?
Basically. When the demand is up, the alternator is up to the task. -------------
Posted By: audiobhan101
Date Posted: December 01, 2005 at 10:29 PM
Anybody have a place for cheap HO alternators. I realise that they dont come "cheap" but lets just say "cheaper" than usual. I got a jegs Chrome one that decided to burn up under the strain of my orion amp. They gave me my money back and said buy a bigger one. just so happens the bigger one is about $250 which is a little pricy
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84 Mazda Rx7 GS
4 15" Audiobahn High Excursion
1 2500W Orion Amp
Custom Box
Posted By: Paradigm
Date Posted: December 02, 2005 at 8:33 AM
audiobhan101 wrote:
Anybody have a place for cheap HO alternators. I realise that they dont come "cheap" but lets just say "cheaper" than usual. I got a jegs Chrome one that decided to burn up under the strain of my orion amp. They gave me my money back and said buy a bigger one. just so happens the bigger one is about $250 which is a little pricy
That's actually pretty good pricewise. May be out of your budget, but for something really good that will be up to the task, you'd be hard pressed to find something less than $300. ------------- VEHICLE: 2002 GMC Sonoma ZR2
Alpine CDA-7940
AudioControl EQT x2
JL Audio 1000/1
JL Audio 10W6 (originals) x3
Kicker ZR120
Kicker ZR460
Polk GXR-6 x4
Polk GXR-4 x2
Posted By: ragoal12
Date Posted: December 02, 2005 at 12:32 PM
if ur looking for a cheap HO alt try searching for an IRAGGI ALT on ebay.. he has a whole store online and they r about the cheapest and alot of guys on this forum run them... but if u looking for something under 250 good luck...
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S.O.B custsoms.. South Omaha, Nebraska
Posted By: audiobhan101
Date Posted: December 02, 2005 at 12:46 PM
Ya and its really really hard to find any thing for an 84 RX7. I have seen Iraggi Alts but I dont think he has any thing for an RX7. I need to find out what else will fit my car and go from there. Most mazda alts are the same but better to be safe than sorry. ------------- 84 Mazda Rx7 GS
4 15" Audiobahn High Excursion
1 2500W Orion Amp
Custom Box
Posted By: dzelaya18
Date Posted: December 02, 2005 at 2:17 PM
While we're on this topic: If you have a 75amp alt. stock, and you upgrade to a 175amp alt., would that put you in danger of frying the stock charging harness and causing a fire?
Posted By: ragoal12
Date Posted: December 02, 2005 at 2:36 PM
audiobhan101 wrote:
Ya and its really really hard to find any thing for an 84 RX7. I have seen Iraggi Alts but I dont think he has any thing for an RX7. I need to find out what else will fit my car and go from there. Most mazda alts are the same but better to be safe than sorry.
i just recieved my iraggi alt today after waiting 3 wks for it and they sent the wrong one.. and now i'll have to wait for a week for him to respond to my email.. i wouldn't buy from him personnally i tried to save a lil money by buying from him and i should have just went with this company i found.. www.alternatorparts.com they might have somehting for an RX 7 if they don't have anything posted.. i would call cause they guy that runs the place is very helpful!!!!! if you upgrade from a 75amp to a 175amp you will need to upgrade ur alternator lead wire... that is the only thing to worry about "frying" as the car pulls its power through the battery and it will only draw the needed current leaving the rest of the current to run your audio stuff ------------- S.O.B custsoms.. South Omaha, Nebraska
Posted By: sedate
Date Posted: December 02, 2005 at 2:38 PM
I'm not sure that is something you would wire only to the wiring harness. I wired my HO alt to the car with 4-gauge grounding it and running directly to the battery... I still connected my wiring harness but I imagine after all the 4-gauge it will see the harness as a higher resistance circuit anyway..
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"I'm finished!" - Daniel Plainview
Posted By: shaggy_one469
Date Posted: December 02, 2005 at 9:03 PM
well you guys have been helpful. thanx. another question. what size alternator should i get to run two mtx 81000d's (or later on, two mtx 81001's)and a 400x4 amp and still have enough output to run the rest of the electrical system?
Posted By: geepherder
Date Posted: December 03, 2005 at 6:05 AM
Tell us the fuse ratings of your amps- that way we know the max current draw.
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My ex once told me I have a perfect face for radio.
Posted By: shaggy_one469
Date Posted: December 03, 2005 at 10:46 PM
150 amp in-line fuses for 81000d's. dunno about the 400x4 yet, i havent decided on one yet. and i need mids and highs. i will probably need help in that area too when the time comes.
Posted By: geepherder
Date Posted: December 04, 2005 at 6:17 AM
That sounds like those are the fuses on your power line. What size fuses are recommended for these amps, or do they have fuses on the outside- this should be in your manual for them. ------------- My ex once told me I have a perfect face for radio.
Posted By: shaggy_one469
Date Posted: December 04, 2005 at 7:34 PM
it says that it requires 150 amp external fuse. thats inline right? there is no place on the amp for fuses. it is working though. with 150 amp fuses at the battery end and the amp end of the power wire.
Posted By: geepherder
Date Posted: December 04, 2005 at 7:45 PM
Okay, then, you want an alt that can support that kind of demand, along with your other accessories- maybe 200a.
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My ex once told me I have a perfect face for radio.
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