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Need a better ground

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=83594
Printed Date: May 16, 2024 at 7:49 PM


Topic: Need a better ground

Posted By: Reeceddogg
Subject: Need a better ground
Date Posted: October 01, 2006 at 10:31 PM

I have a 03 taurus and now matter where i test with my dmm the lowest resistance i could find is 6.0. Other than run a ground from the battery does anyone have any ideas. and is it better to have a long ground with lower resistance than have a short ground with hig resistance.



Replies:

Posted By: shaggy12volt
Date Posted: October 01, 2006 at 10:54 PM

Reeceddogg wrote:

I have a 03 taurus and now matter where i test with my dmm the lowest resistance i could find is 6.0. Other than run a ground from the battery does anyone have any ideas. and is it better to have a long ground with lower resistance than have a short ground with hig resistance.

what are you trying to ground?



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The Shagmaster
1999 Chevy Suburban 15" lift sittn on 22's sets 7'5"
1992 Chevy Astro Van all Bagged out Dubbed THE SUICIDER
Installing for over 18 years Looking for empolyment NOW send PM for resum




Posted By: Flakman
Date Posted: October 01, 2006 at 11:41 PM

Are you using existing stock bolts? If so, this could be the problem. Pick a good solid piece of the body and strip the paint. Also, try upgrading the "big 3" (sticky near the top of this forum), the ground from frame to battery may also be the issue.



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The Flakman
I feel strange. I have deja vu and amnesia at the same time.

John | Manteca, CA




Posted By: Reeceddogg
Date Posted: October 02, 2006 at 12:15 AM
I'm trying to ground my system. I did start the bid three. I did the neg to engine block and engine to chasis grounds. but i'm waiting fo my new altenator before i do the charge back wire. I tested several locations through out the car but i got the same result. I used my wire brush to make sure that all the paint was gone. but the stock bolt gave me the lowest resistance.




Posted By: sparkie
Date Posted: October 02, 2006 at 5:37 PM
You can't measure resistance in a circuit that is live. If you are trying to measure the resistance to ground in your ground wire for your system, you MUST disconnect the negative battery cable first to kill any active circuits fouling up your readings. Using resistance to check grounds isn't the best way to do it. Leave the battery hooked up and turn your system on. Set your meter to DC voltage. Measure from the any point in the ground wire to a KNOWN good ground and note the voltage. As an example, place one probe on the amp ground terminal and the other to a clean area of the chassis next to where your ground wire terminates. You should get a reading of 0.2 volts or less. If it is higher than this then you have a bad ground cable. You may want to do a search on grounding for more information.

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sparky




Posted By: soultinter
Date Posted: October 03, 2006 at 4:01 PM
what is  " neg to engine block"?,  is it housing of alternator or engine block to chassis?




Posted By: forbidden
Date Posted: October 03, 2006 at 4:07 PM
Battery negative to engine block.

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Top Secret, I can tell you but then my wife will kill me.





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