Grounding!! is bolted to floor enough for batteries and amps?

[QuantumAudio]

Out of experience.

If you have 2 big batteries in the rear, and 2 big amps, all grounded to one spot on the floor through an existing M6 threaded bolt hole in the floor, floor sanded bare, but FOUR 2/0 lugs grounded to that one spot all in the rear of a car. Is that enough??

Or would drilling a hole in the floor and running all grounds an extra 2 feet and maybe tapping threaded holes in my frame would be better?? Beneficial at all to make a difference in voltage??

Anyone have experience on whats better?? Running back to front isnt an option

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[Blue Fury 10+ year member]

Measuring the resistance is the best way to tell.

 

[z0n3d0u7 10+ year member]

Indeed, But if youd post Fused amperage of amp's, Model of car, Ect, Id help anyone that could possibly help in this situation, help you.

 

[Scoobydoo 5,000+ posts]

Mount all grounds through the trunk floor into the gas tank, that should be enough

 

[QuantumAudio]

How do you measure resistance?? . Stick it to ohms function and ground probe to grounding point, positive probe to _____??

Whats an acceptable ammount??

 

[QuantumAudio]

??

 

[basscort2009 5,000+ posts]

your half way there. take all the grounds from your body (u said u had about 4 of them) and run a bolt all the way through the floor and on the bottom of the car go from there(with another peice of wire) and go to the frame. thats how its done

 

[QuantumAudio]

Hmmm, never thought of that, extend it from underneath the car, through the car with a bolt (probly wing nutted) and to the frame

You think the way I have it for about 400 amp MAX total is to much?? Floor isnt a good spot?

All I really ever see is basic floor grounds from anybody, havent seen much of anyone go to the darn frame, just wonderring if its necessary and will benefit

 

[NhustlaR 10+ year member]

What you can do to check the resistance is set the dmm to ohm, put one end of the probe where your ground wire is grounded, and the other probe to the amp end of the ground wire. You should be as close to 0 as you can

 

[basscort2009 5,000+ posts]

What you can do to check the resistance is set the dmm to ohm, put one end of the probe where your ground wire is grounded, and the other probe to the amp end of the ground wire. You should be as close to 0 as you can

this, but only this if its after how i said to do it! lol. that way is flawless

 

[sciullo779 10+ year member]

What you can do to check the resistance is set the dmm to ohm, put one end of the probe where your ground wire is grounded, and the other probe to the amp end of the ground wire. You should be as close to 0 as you can

an ohm test can be very decieving, the dmm is only using a few volts to check for resistance, for instance you can ground a 5000wrms amp with a chunk of 10gauge wire and you wont get much resistance, but when that amp dumps the power through that ground the resistance to that high of a load will fry the wire, the only proper way to measure a ground is with a load test, put the dmm on voltage and put the pos probe on the AMP connection to ground with the ground still attached, and the negative touching another small bare metal spot next to the bolt ground that the amp ground is connected to, use a test cd for a constant output of the amp and measure the voltage drop, that will tell you how much voltage or how much of a bottleneck you made at that ground point the lesser that number is, the better..... at least thats how i think you do a voltage drop test

 

[12voltz+- 10+ year member]

honestly id go straight to the front batter back to the other 2 large batterys in back and also to the chases in back clean all paint off go through a thick spot something like a double weld joint a think support ect... then also add a thick ground to the front battery to the alternator casing and from the cassing to the chassie

 

[michaellane 5,000+ posts]

scammer