grounding *pics*

[LBX2G 10+ year member]

Exactly.

so how would one go about this adventure.

 

[turnstylez18 10+ year member]

How about a strut tower bolt?Those are usually pretty good.

what are those? im thinking bout getting a grounding adaptor too

 

[btnhfan 5,000+ posts]

Pull the carpet away to where your rear shocks come up.

 

[turnstylez18 10+ year member]

do you at least have the amps secured somehow? or do they just slide around?

everything is bolted on..nothing moves...

 

[JimJ 5,000+ posts]

so how would one go about this adventure.

Take your DMM.

Wire a long lead from the negative side of the battery, plug that in on one lead of the DMM.

Set it to read resistance...Ohms.

Poke around with the other lead until you hit a spot that reads 0 Ohms or very close to it...within a few tenth's is fine, usually.

 

[azbass 5,000+ posts]

I think we both know 99.9% of the people on this forum arent going to whip out their DMM's to measure their entire trunk for resistance. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

//content.invisioncic.com/y282845/emoticons/wave.gif.002382ce7d7c19757ab945cc69819de1.gif

 

[turnstylez18 10+ year member]

this is the fastest and the most ppl responded to my post in so little time..haha

 

[n2audio 5,000+ posts]

Take your DMM.Wire a long lead from the negative side of the battery, plug that in on one lead of the DMM.

Set it to read resistance...Ohms.

Poke around with the other lead until you hit a spot that reads 0 Ohms or very close to it...within a few tenth's is fine, usually.

I've always been a bit skeptical of people just "whipping out" the trusty DMM for a measurement that's a fraction of a fraction of an ohm. All the DMM's I've messed with (a few good, a few cheap) detect a short at anything below an ohm or so.

Another thing I see some people claim is you should ground somewhere that gives a reading around .3. Which can't possibly be right.

And you mention running a lead (relatively small ga I assume?) to the battery in which case the resistance of the wire would be WAY higher than the resistance of the chassis. So that couldn't possibly provide an accurate measurement either.

The only method I've heard to truely measure the resistance of a good chassis ground that makes sense would be to have some sort of power supply that can pass a huge amount of current through the chassis and use a DMM to measure relative voltage drop at various grounding points and use that to calculate resistance.

Regardless - I just pick a spot that's convenient that doesn't give me any noise issues. In my car it's a seat belt bolt, and in my wife's SUV it's a seat frame-to-floor bolt -- it used to be on a luggage strap bracket bolt in the cargo area, but that gave me alt whine.

 

[kuijo 10+ year member]

Is that the fisher-price box?

 

[n2audio 5,000+ posts]

Is that the fisher-price box?

//content.invisioncic.com/y282845/emoticons/hilarious.gif.02a037aad04aa96f19982b298a3d70a8.gif

That was pretty good...

maybe it came with the matching action figure?? //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[Decado 10+ year member]

Take your DMM.Wire a long lead from the negative side of the battery, plug that in on one lead of the DMM.

Set it to read resistance...Ohms.

Poke around with the other lead until you hit a spot that reads 0 Ohms or very close to it...within a few tenth's is fine, usually.

Instead of a long lead, you could just use a piece of wire and bring that back to your trunk, because, where in the hell would you ever get a lead that long? //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif Unless that's what you meant //content.invisioncic.com/y282845/emoticons/eyebrow.gif.fe2c18d8720fe8c7eaed347b21ea05a5.gif .

 

[Sleeklsc 5,000+ posts]

//content.invisioncic.com/y282845/emoticons/wave.gif.002382ce7d7c19757ab945cc69819de1.gif

x2..

i grounded mine right to the frame..atleast the seat belt bolt for the rear seat(wich goes into the frame)//content.invisioncic.com/y282845/emoticons/naughty.gif.94359f346c0f1259df8038d60b41863e.gif

i've grounded many an amp to shitty grounds throughout car...i';ve found that i get less " dimmage" if a proper ground is inplace

 

[turnstylez18 10+ year member]

k i found a good ground this afternoon..its the actual chasis of the car..so i drilled a lot...scraped the paint..and everything is secure..its baremetal..hopefully everything is good...

 

[adam71 5,000+ posts]

//content.invisioncic.com/y282845/emoticons/hilarious.gif.02a037aad04aa96f19982b298a3d70a8.gif
That was pretty good...

maybe it came with the matching action figure?? //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

OOOO OOOO dibs on the action figure.//content.invisioncic.com/y282845/emoticons/eek.gif.771b7a90cf45cabdc554ff1121c21c4a.gif

 

[adam71 5,000+ posts]

One thing that wasn't mentioned in this thread is that after you find a good grounding spot, sand it down, and tighten it down. You need to put a nice little coat of spray paint over the surface you sanded. This will prevent the area from rusting seeing how you just sanded away the paint and clear coat.//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

BTW, I grounded my system in the spare tire well which is empty now. I ran a bolt from underneath the car into the tire well and used lock washers and nuts. Results, NO engine noise what so ever.