everybodyknowme Posted September 17, 2014 Report Share Posted September 17, 2014 Hello everyone I will try to make this short. I have an 02 expedition with a stock 130amp alt running a Hifonics BRX 2400 @1ohm and a Hifonics 640.4 @4ohm. I have a duralast gold 750CCA starting batt and a yellow top optima in the back isolated by a stinger relay. Big 3 is done with 0ga wiring and 0ga is ran throughout the truck to the optima batt in back and amp rack. 0ga is also ran to the BRX 2400. I'm being told my OEM alt won't last but people are blown away that my voltage never drops below 14v (not sure if I'm driving the system hard enough) but the signal is loud and clip free. In my install I made sure my wiring was done correctly and grounds were solid and it's been about a year running this power with no issues. So my question is do I need an HO alt? I called mechman to get a quote and I can get a 240amp for $349 (great price) but I don't want to spend the money if I done have to. Please give advice. Thanks Link to comment Share on other sites More sharing options...
MaxVolume Posted September 17, 2014 Report Share Posted September 17, 2014 if you're not getting voltage drop I don't see the need to upgrade, might as well let it run its natural life then get another OEM one Link to comment Share on other sites More sharing options...
pioneerforlife Posted September 17, 2014 Report Share Posted September 17, 2014 If you never drop below 14, then no. But I'm surprised you don't drop at least into high 13's. Where are you measuring voltage from. 2007 Ford Focus SES Hatchback Pioneer HU 4 Digital Designs 9515i's in a B pillar. 2 Soundstream XXX 15K's (running at 16 volts) Soundstream Mids/Highs in custom door panels (getting rebuilt soon) Soundstream TA2.160 and TA2.400 Sky High and KNU wiring 3 Banks of Maxwell caps Winston Lithium (not a fan) Bump4Life 250 Amp Alt. aka USAlternators Soundstream Focus and Avenger Build Log Instagram @p4linnovation YouTube: Team Blowin Loud Link to comment Share on other sites More sharing options...
everybodyknowme Posted September 17, 2014 Author Report Share Posted September 17, 2014 Im measuring from the amp rack distribution block. Also I might drop to 13.9 but I've only seen that a few times. Link to comment Share on other sites More sharing options...
Guest Posted September 17, 2014 Report Share Posted September 17, 2014 if you're reading 14v on the dash needle, its wrong. you need to measure voltage at the amp power terminals. edit: if you're measuring voltage at the amp, you're not pulling more than a few hundred watts. Link to comment Share on other sites More sharing options...
everybodyknowme Posted September 17, 2014 Author Report Share Posted September 17, 2014 also I might drop to 13.9 but I've only seen that a few times Link to comment Share on other sites More sharing options...
everybodyknowme Posted September 17, 2014 Author Report Share Posted September 17, 2014 I have a stinger voltmeter wired directly to distribution block and dash mounted the display. I also checked with my handheld voltmeter and get the same reading Link to comment Share on other sites More sharing options...
GSanders17 Posted September 17, 2014 Report Share Posted September 17, 2014 I have a stinger voltmeter wired directly to distribution block and dash mounted the display. I also checked with my handheld voltmeter and get the same reading Are you checking with the multimeter during playback? If not I'm willing to bet you have more drop than you realize, those stinger meters are too slow to respond to be accurate enough. Link to comment Share on other sites More sharing options...
Acme Tops & Tunes Posted September 17, 2014 Report Share Posted September 17, 2014 An aftermarket high output alternator is always recommend however, in some cases not absolutely needed. The only thing to keep in mind would be that your vehicles stock electrical system was designed to run the OEM components and maybe a few additional minor upgrades. You are doing that plus all the aftermarket equipment you just listed. To make a long story short, it's not needed but definitely recommended. Acme Tops & Tunes 6430 Franklin Blvd. Sacramento, CA 95823 www.acmetopsandtunes.com PH 916.429.2293 FX 916.429.2296 Facebook YouTube Twitter Yelp Google Link to comment Share on other sites More sharing options...
TRON Posted September 18, 2014 Report Share Posted September 18, 2014 Something doesn't add up if the amplifier has the ability to pull more amperage than the alternator can make but still keep steady voltage. Your amplifier is definitely not getting close to the rated power output. Avalanche Alpine Type S comps Alpine Type S 10'' Alpine MPR-F300 Alpine MRX-M50 Mechamn 270 XS Power d3400s Link to comment Share on other sites More sharing options...
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