HO 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=55315
Printed Date: May 15, 2025 at 1:51 AM
Topic: HO alternator?
Posted By: AJRXtreme
Subject: HO alternator?
Date Posted: May 07, 2005 at 8:50 PM
I just hooked up my third amp today. After about 2 hours of playing time my whole system shut down. I checked the fuse at the battery and it looked fine, so i switched it out with another fuse that I got from my friend but i dont know for sure that its ok. Again i turn on my car and nothing turned on. I checked all the wiring and everything is hooked up right. When the system turned off i pulled over and looked at my capacitor and it said .6 when it should be at around 14. I have a jbl 600.1, memphis 500d, and a memphis 2004 for my mids and highs. Do I need a high output alternator? Ive heard those are the solution for your battery not being able to supply enough current for all your amps. If anyone can help please do. thankyou
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03 F150 on 24's
HU:Pioneer DVD5700
Frt:MC57
Subs:(12)S12L7
Amps:(3)KX2500.1's, MC-2004
Replies:
Posted By: geepherder
Date Posted: May 07, 2005 at 9:30 PM
Check power before and after the fuse. I think your fuse is blown, and you've drained the cap. Recharge the cap before you slap another fuse in there, or you might simply blow the next one. Yes, you should definitely upgrade the alternator, and the vehicle's power/ground wiring. ------------- My ex once told me I have a perfect face for radio.
Posted By: Captanham
Date Posted: May 07, 2005 at 10:20 PM
sounds like the fuse for sure, or some connection between the bat and the cap, if you have a fuse holder that is really cheep a lot of time it will arc between the fuse and it's conections, so make sure those are tight, and check your fuse with an ohmeter if you aren't sure that it's blown or not, it's probably a good idea to think about upgrading your alt and grounding and things,,,, but that's not what's causing your cap to read no voltage. ------------- Bad Boys Customs
audio - video - security
If you use it. Suport it. Donate to the 12 volt!
Posted By: AJRXtreme
Date Posted: May 07, 2005 at 11:04 PM
Ok I found out the problem. I went to an audio shop about 2 weeks ago, and tried to find a 4 guage splicer. The guy said they dont make any but i can try a distribution block that turns one 4 guage into two 4 guage outputs. I didnt buy it cause it was $20. I stripped both sides and crinkled them together. I rapped electrical tape around the connection. For about 2 weeks i didnt have any problems with my system when i was running 2 amps with 2 subs and 4 speakers. Once i added the other amp and the 2 15's the system just shut off after about 2 hours of playing time. So I guess the cap just got drained. If i bought an HO alternator, would i need around 180 amps? I know there is an equation for how many amps i would need for this system but i cant find it. Also would i be able to install it myself if i bought one off ebay? Do i have to buy one specifically for my car? When you guys said i would have to replace my grounds and wiring did u mean that I would need to upgrade to 0 guage? thankyou
-------------
03 F150 on 24's
HU:Pioneer DVD5700
Frt:MC57
Subs:(12)S12L7
Amps:(3)KX2500.1's, MC-2004
Posted By: AJRXtreme
Date Posted: May 07, 2005 at 11:08 PM
would this alternator be ok for a 98 expedition?
high output alternator------------- 03 F150 on 24's
HU:Pioneer DVD5700
Frt:MC57
Subs:(12)S12L7
Amps:(3)KX2500.1's, MC-2004
Posted By: geepherder
Date Posted: May 08, 2005 at 7:58 AM
They do make splices for 4 gauge- we carried them when I worked at Ultimate, but they're not very common. If you strip back enough, you can solder them together, but you shouldn't just twist them and tape them up. You don't have to upgrade your grounds to 0 gauge, 4 gauge would work, 2 gauge would be better. That'd probably be okay, but you should contact the seller with any questions. ------------- My ex once told me I have a perfect face for radio.
Posted By: Paradigm
Date Posted: May 09, 2005 at 10:31 AM
My suggestion (2 actually): 1) save up your money and buy the correct parts for your system (d-blocks, ho alt, etc.) and install it correctly. 2) take it to a shop and let them take care of it for you, as you don't sound like you have much experience to get the job done right. Take it for what it's worth... ------------- 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: c3d
Date Posted: May 09, 2005 at 3:01 PM
it takes 88amps per 1000watts. your alternator won't put out enuf power to power your Car, probably around 50 amp draw, and your sound system. I would go with a 200-225amp alternator. You will just other keep destroying your electrical system, and your batteries. your batteries can only take so much draining and charging. if you keep it up, you wont have enough power to run/start your car.
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1987 Nissan 300ZX N/A
1994 Audi 90 Quattro CS
Posted By: BIGho
Date Posted: May 19, 2005 at 12:53 AM
try this:
https://www.highoutputalternator.com/TechCalcs/alternatorcurrentratingcalculator.htm
and this:
https://www.highoutputalternator.com/TechCalcs/systemdesignassistant.htm
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