3 volt drop

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mobile1

Silver - Posts: 479

Joined: February 23, 2004

Location: United States

Posted: October 01, 2004 at 10:09 AM / IP Logged

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.

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DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: October 01, 2004 at 10:18 AM / IP Logged

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?

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mobile1

Silver - Posts: 479

Joined: February 23, 2004

Location: United States

Posted: October 03, 2004 at 12:06 AM / IP Logged

this is actually a test question I need to figure out. the drop only happens when the amp turns on. measured with a DMM

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flynntech

Copper - Posts: 275

Joined: April 15, 2004

Location: United States

Posted: October 03, 2004 at 11:06 AM / IP Logged

Is this a Sony X-plode amp? If so, this is the problem.....he he

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jeffchilcott

Platinum - Posts: 2,483

Joined: April 11, 2002

Location: United States

Posted: October 03, 2004 at 3:06 PM / IP Logged

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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dpaton

Copper - Posts: 141

Joined: July 19, 2004

Location: United States

Posted: October 03, 2004 at 10:32 PM / IP Logged

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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JMaxx93

Copper - Posts: 73

Joined: December 02, 2003

Location: United States

Posted: October 03, 2004 at 10:42 PM / IP Logged

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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3 volt drop

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