grounding?

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schmoo

Copper - Posts: 62

Joined: April 21, 2005

Location: Canada

Posted: November 12, 2005 at 4:03 PM / IP Logged

help me out here. My friends amp quit on him a week ago. It works fine on the bench, but in the vehicle when it powers on the voltage drops to about 3 volts. It's a strange one because the ground shows 1-2 ohms but when you turn the ignition on it jumps up to 60. It's in a 98 altima. What am I missing here?

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thefivespeeder

Member - Posts: 28

Joined: November 06, 2005

Location: United States

Posted: November 12, 2005 at 4:44 PM / IP Logged

how are the wires attached to the amp? if you have some spare wire attach it a few inches from the battery, even jump the +12 to the remote, then see if it still acts up

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DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: November 12, 2005 at 5:47 PM / IP Logged

What's your grounding point? If you're trying to read ground resistance with the amp on, you will get funky readings that are meaningless. Also, what "drops to three volts"?

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schmoo

Copper - Posts: 62

Joined: April 21, 2005

Location: Canada

Posted: November 14, 2005 at 8:24 AM / IP Logged

amp works fine when jumered off the battery. But, move the ground to the engine block and it won't fire up. The original ground was taken to a seat bolt with paint removed. And the 12 volt supply goes down to three volts when the ignition is turned on. After you remove the remote wire, the voltage slowly builds up from 3 volts, back up the 12 as if a cap is charging. (?)

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thefivespeeder

Member - Posts: 28

Joined: November 06, 2005

Location: United States

Posted: November 14, 2005 at 9:09 AM / IP Logged

idk if it works everywhere else i guess i'd say it's the wiring

geepherder

Platinum - Posts: 3,668

This member consistently provides reliable information

Joined: October 27, 2003

Posted: November 14, 2005 at 1:28 PM / IP Logged

Yes, it's definitely a wiring problem, but your ground shouldn't be between 1 and 2 ohms. A good ground should be .3-.4 ohms or less. Looks like it's time to rewire.

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kirktcashalini

Silver - Posts: 492

Joined: November 13, 2005

Location: United States

Posted: November 14, 2005 at 1:28 PM / IP Logged

If you cant get a solid ground, possibly your battery needs a heavier connect to the chassis. I am assuming you are using good quality wire of a good size and cleaned the shmutz around where the ground bolts in. I had a alike problem, i needed to give the amp more ground, just because the quality wasnt fully there so i tested it out with 2 wires doing the ground, and when it worked, just bumped up the gauge a tid, worked great.

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grounding?

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