ground check
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=80479
Printed Date: July 14, 2025 at 9:29 AM
Topic: ground check
Posted By: ralphpylayanum1
Subject: ground check
Date Posted: July 19, 2006 at 1:21 AM
hey guys to make it easier im gonna get the red end of my tester put it on the ground lead which goes on the battery whcih will be disconected from the batery and put the blackl wire from the tester to the other end my amp now one question if the other end that goes to my amp is jumped from a capacitor does it matter????
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rafael rodriguez
Replies:
Posted By: forbidden
Date Posted: July 19, 2006 at 1:53 AM
I assume that you are measuring the ground return resistance? If that is the case, then the answer is no.
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Top Secret, I can tell you but then my wife will kill me.
Posted By: ralphpylayanum1
Date Posted: July 19, 2006 at 1:33 PM
so how is the easy way of u explaing it to me so the i will understand better on hot to do that because i know if there is not any ground u rreal arent gettin current
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rafael rodriguez
Posted By: geepherder
Date Posted: July 19, 2006 at 8:42 PM
It sounds like you're trying to make this more complicated than it needs to be. Rob's answer was no- it doesn't matter if you have a capacitor hooked up when you measure ground resistance. You don't need to disconnect the battery for that matter, either. Just make sure the system is off before measuring. ------------- My ex once told me I have a perfect face for radio.
Posted By: Flakman
Date Posted: July 19, 2006 at 11:40 PM
Yep...as long as the circuit is not complete to the battery, the CAP won't be drawing from the meter.
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The Flakman
I feel strange. I have deja vu and amnesia at the same time.
John | Manteca, CA
Posted By: coppellstereo
Date Posted: July 20, 2006 at 2:15 AM
touch one lead to battery's negative post
other to your amps' ground
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Posted By: Mad Scientists
Date Posted: July 20, 2006 at 5:23 PM
and have the meter set to measure DC volts, and have the music turned up.. its the best way to measure circuit path resistance. Jim
Posted By: coppellstereo
Date Posted: July 20, 2006 at 8:13 PM
wouldnt you measure resistance in ohms?
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Posted By: geepherder
Date Posted: July 20, 2006 at 9:25 PM
Yes, resistance is measured in ohms, but voltage is the best way to test a ground. Even if a ground checks okay when you "ohm it out", it can still cause a significant voltage drop under load.
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My ex once told me I have a perfect face for radio.
Posted By: coppellstereo
Date Posted: July 20, 2006 at 11:42 PM
that makes sense.
Do you watch the output voltage of the amp, or the output at the battery?
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Posted By: geepherder
Date Posted: July 21, 2006 at 6:07 AM
You watch the voltage across the ground while the system is running. This will tell you the voltage drop.
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My ex once told me I have a perfect face for radio.
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