amp cutting out, low voltage!!
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=56540
Printed Date: May 06, 2024 at 7:28 AM
Topic: amp cutting out, low voltage!!
Posted By: tokyofist
Subject: amp cutting out, low voltage!!
Date Posted: May 27, 2005 at 3:53 PM
My amp (ESX Q1204, 120w/ch @ 4 ohms) has been shutting off at moderate volumes. Gains are all the way down. At first I suspected the remote turn on, but voltage is a steady 14.1 or so even when the amp cuts out. However, the voltage across the constant power lead drops from 14 to low single digits and amp shuts down, powers right up again, shuts down, so on and so forth. I'm suspecting its a grounding issue. I've double checked everything, but will go triple check right now, just wanted to throw this out there in the time being. Ground wire from amp is 4 gauge, paint scraped and sanded. 2 of the big3 have been done, excluding alt+ to batt+, which I may get to today. What should I be looking at? Thanks.
Replies:
Posted By: DYohn
Date Posted: May 27, 2005 at 4:24 PM
High output alternator. ------------- Support the12volt.com
Posted By: tokyofist
Date Posted: May 27, 2005 at 4:26 PM
my stock alt is 90 amps. i've been running this amp for 6 months without any problems. this started since i upgraded wiring under the hood.
Posted By: skoldspuppy
Date Posted: May 27, 2005 at 6:56 PM
Finish the Big 3 upgrade that may help you,
You only have 480 total watts a 90 amp alternator should easly handle that amount, In my backup car Im running a Memphis 500D 500watts@ 2ohm on a cheap ass kia sportage with a 70amp alt pushing a P3 12 and I have no issues nada.. zip.. nothing
Good Luck ------------- 2004 Honda Civic Ex 4Dr
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Posted By: DYohn
Date Posted: May 27, 2005 at 8:52 PM
tokyofist wrote:
my stock alt is 90 amps. i've been running this amp for 6 months without any problems. this started since i upgraded wiring under the hood.
Ah. Something you did has changed the output of the system. You've either created a bad graound or bad battery connection or you may have something connected incorrectly. ------------- Support the12volt.com
Posted By: tokyofist
Date Posted: May 27, 2005 at 9:28 PM
i have left all stock wiring thus far, so it seems that grounds could not be any worse than before. i have yet to measure voltage at the battery when the amp cuts out, but i will tomorrow. this would tell me if the entire electrical system voltage is dropping, or if the problem is only with the amp power wire? when the amp shuts down, nothing else seems to be affected (i.e. no dimming, head unit does not turn off, etc), which leads me to believe that the voltage of the electrical system as a whole is not dropping.
as far as connecting things incorrectly, here is what i have done thus far:
1) battery negative to chassis
2) alternator mounting post (engine block) to chassis
alt to batt positive yet to be upgraded.
thanks for your help, DYohn.
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