Same problem but fixed the ground. EXPERTS please help.

[jklfd 10+ year member]

Ok, some of you might remember the problem I had with my system, as my subwoofers cut out at high volumes but the amp power light is still on. My subs work again after i turn the car off, and turn it back on after 30mins.

So before i had my ground grounded to paint behind my backseat on a screw so i thought that was causing the problem. I sanded off the paint so its grounded on bare metal now. Thinking that that would solve my problem, i am uberly disappointed it didnt.

Now, my subwoofers make a humming noise, then it cuts out.

It'll work again if i turn off the car, and turn it back on after 30mins or so.

Now that it ain't my ground that is causing the problem, What could it possibly be?

Before there was no humming sound before my subs would cut out, after cleaning the ground there seems to be a humming sound.

PLEASE help me, ALL your input is greatly appreciated. Im pretty disappointed as of now.

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[jeeper07 5,000+ posts]

clipping? and humming id say check the radio ground, or rcas

 

[jklfd 10+ year member]

Yes it clips when im blasting my music. What do i check for for the Rcas and the HU ground?

 

[jklfd 10+ year member]

anyone else? please!!!

 

[knukonceptz 10+ year member]

Do you have a voltmeter? I would start with the turning off problem, then go back to the hum. Is you amp over heating? Why else would it need 30 minutes to come back on? If you turn off the car, and turn it back on it does not instantly come back? Have you waited in the car or near the amp? If so do you ever hear a click, like a relay or something???

 

[jklfd 10+ year member]

Do you have a voltmeter? I would start with the turning off problem, then go back to the hum. Is you amp over heating? Why else would it need 30 minutes to come back on? If you turn off the car, and turn it back on it does not instantly come back? Have you waited in the car or near the amp? If so do you ever hear a click, like a relay or something???

When i turn off the car and turn it on right away, my subs will not work. Gotta wait a while first. Its wierd cause my amp does not get really hot, but maybe it turns off cause it overheats, but it doesnt feel hot to the touch

Yes i have a voltmeter, where do i begin checking?

And no i dont hear any clicking, you just notice cause all of a sudden theres no bass. Could it be loose terminals inside the amp? My amp is bolted onto the back of the box.

 

[subarugeek]

Ah, lack of a common ground. Check where and how your alternator/engine is grounded and if nothing else, extend multiple grounds to the chassis. Installing two way radios I encounter similar problems... Hope this helps alittle bit.

 

[wilzyx 5,000+ posts]

maybe you should ground your amp to the negative battery terminal, see if that helps

 

[ilvwhtgrls 10+ year member]

maybe you should ground your amp to the negative battery terminal, see if that helps

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[blue93corsica 10+ year member]

maybe you should ground your amp to the negative battery terminal, see if that helps

was gonna suggest something sililar, are you using 4 awg cables? if so upgrade your battery negative terminal to chassis and while your at it do the big three with at least 4 awg

 

[knukonceptz 10+ year member]

First heck your voltage at the battery and then at your amp (check it when the stereo is working and then check it when the problem occurs)

Start with that to see what the voltage is at, no sense in running new wire if its not the problem

 

[jklfd 10+ year member]

First heck your voltage at the battery and then at your amp (check it when the stereo is working and then check it when the problem occurs)
Start with that to see what the voltage is at, no sense in running new wire if its not the problem

Where do i put the leads of the voltmeter to measure the voltage? Measure which parts specifically? The battery?, and which parts of the amp? The power, or speaker terminals?

 

[noob with an RS 10+ year member]

set voltmeter to read DC voltage.. red lead goes to battery positive and black lead goes to battery negative. then at the amp.. the positive wire coming from the battery goes to the red lead and the negative wire coming from the battery goes to the black lead. you should get the same readings at the battery and at the amp. if you get a lower reading at the amp, or no reading at all, then there's something wrong between the battery and amp..

 

[Prowler573 5,000+ posts]

Where do i put the leads of the voltmeter to measure the voltage? Measure which parts specifically? The battery?, and which parts of the amp? The power, or speaker terminals?

Set the multimeter to DC Voltage and put the positive (red cable) lead on the positive terminal on the battery (marked with a "+" sign usually) and then touch the negative multimeter lead (black cable) to the negative battery post (usually marked with a "-" sign)

Then when testing voltage at the amp touch the positive multimeter lead to the power cable connection on the amp and the negative multimeter lead to the ground cable connection on the amp.

See what voltages you are reading at both locations and get back to us.

Edit: noob beat me to it //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[jklfd 10+ year member]

Im using a capacitator, does that matter at all? should i measure the voltage of the capacitator? It readslike 14.4 on the digital reader.

Ok, I'll let you guys know what the voltage is in a couple days. So measure it before the problem, and during the problem right?