3 volt drop
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=40097
Printed Date: May 13, 2024 at 9:50 PM
Topic: 3 volt drop
Posted By: mobile1
Subject: 3 volt drop
Date Posted: October 01, 2004 at 10:09 AM
what would cause a 3 volt drop in the power wire of an amp only when the car is turned on? no other wiring is affected. the battery does not have a voltage drop, only the amp power wire.
Replies:
Posted By: DYohn
Date Posted: October 01, 2004 at 10:18 AM
The voltage drop occurs when the car is turned on or when the amp is turned on? Where and how are you measureing the voltage drop? ------------- Support the12volt.com
Posted By: mobile1
Date Posted: October 03, 2004 at 12:06 AM
this is actually a test question I need to figure out. the drop only happens when the amp turns on. measured with a DMM
Posted By: flynntech
Date Posted: October 03, 2004 at 11:06 AM
Is this a Sony X-plode amp? If so, this is the problem.....he he
Posted By: jeffchilcott
Date Posted: October 03, 2004 at 3:06 PM
i have seen the sony amps do this dont ask why, but they drop voltage wen turned on, i dont know if they have a huge draw initally or what. I stay away from all sony products
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Posted By: dpaton
Date Posted: October 03, 2004 at 10:32 PM
Any voltage drop is caused by one of two things: source sag or resistive losses. If the battery stays good (12V ish) when the amp is on, it means you're losing the voltage in your wires. Without knowing the guage of the power wires, their termination method, and the same info for the ground, all I can do is theorize.
-dave
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Posted By: JMaxx93
Date Posted: October 03, 2004 at 10:42 PM
9 times outta ten its either a bad ground. (either on a poorly welded piece of metal or loose) or the fuse holder has a bad connection somewhere.
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