HOW TO: The big 3 - Audio & Electronics Forum

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HOW TO: The big 3
Monday, December 05, 2005 5:25 PM
As many of you know, upgrading the "Big 3" wires in your engine compartment can lower the overall resistance of your entire electrical system. The effects of the lower resistance are typically:

1) Reduced dimming and smaller voltage drops
2) More stable voltage and better current flow
3) Less strain on your vehicle's charging system

So for those of you looking for a cheap and easy way to upgrade your system and help out your electrical system without adding a high output alternator or an aftermarket battery, this is the modification for you. If you have heavy dimming or are getting large voltage drops during loud bass hits, but you don't have the money to spend on a high output alternator or a battery, upgrading your vehicle's "Big 3" will usually help to reduce and sometimes even eliminate the problems. So without further ado, the "Big 3" wires are:

1) Battery negative to chassis
2) Alternator to battery positive
3) Chassis to engine

Now, I suppose it would help if I explained what each of these wires does, and to do that I would like to paraphrase an explanation by IMTfox from a while ago: Think of your vehicle's charging system as two different circuits, one consisting of your amplifier and your battery, and the other consisting of your alternator and your battery. The current in your electrical system flows from your positive battery terminal to your amp, from your amp's ground to the chassis, and then from the chassis back to the negative battery terminal. But how does it get to the positive terminal in the first place? That's where the alternator comes in. Current in the second circuit flows from your alternator's positive post to the battery's positive terminal, then from the battery's negative terminal to the chassis, and from the chassis back to the block, which happens to be the grounding point for your alternator.

So, from your battery, you have the power wire going to the power terminal on your amplifier and then your amplifier is grounded to the chassis of the vehicle. From here the current needs a way to get back to the negative battery terminal, and that way is through the first of the "Big 3," the battery negative to chassis wire. Upgrading this wire will "upgrade" the circuit between your battery and your amp by giving the current a larger path to flow through to get back to the battery.

Now, think of your alternator as the battery and your battery as the amp. From the positive post on your alternator, you have the second of the "Big 3," the alternator to battery positive wire supplying "power" to your battery. From there the battery, just like your amp, is grounded to the chassis through the wire mentioned in the previous paragraph. Again, the current needs a way to get from the chassis back to the alternator's "negative terminal" and that way is through the last of the "Big 3," the chassis to engine wire. Since your alternator is most likely mounted to your engine block using a metal or conductive mounting bracket, you can simply add your new wire from the chassis to one of the mounting posts for the alternator. Upgrading these two wires will "upgrade" the circuit between your alternator and your battery, again giving the current a larger path to flow through.

----------------------------------------------

Now that you understand exactly what the "Big 3" do, it's time to upgrade them to a larger gauge wire. You can use regular power wire from installing your car audio equipment, ring terminals, and crimping equipment just the same as you would for any other install. Let's start with the first of the "Big 3," the battery negative to chassis wire:

1) Disconnect your battery's negative terminal and get the stock wiring out of the way. You might have to cut it and crimp a new ring terminal onto it. I found it helpful to use aftermarket battery terminals with multiple ports on them also.

2) Scrape away the paint and drill the hole for your connection of the larger wire, or connect it to the stock grounding point. Either way you do it, make sure it is bare chassis metal, not covered by paint, and that the connection is as tight and secure as possible:


3) Secure the new wire to the chassis and reconnect the vehicle's stock chassis ground, but DON'T reconnect the vehicle's negative battery terminal yet! You may find it helpful to cover the negative battery terminal with a cloth or other non-conductive material and just lay the terminal on it until you're ready to reconnect it later.




Moving on to the next of the "Big 3," let's upgrade the alternator to battery positive wire:

4) Locate the vehicle's alternator and look for a terminal post connected to it. The post shouldn't be hard to find. It should have only one wire connected to it, and it should lead to the positive terminal on the battery, while passing through the starter first. (in some cars..the fuse box)


5) Disconnect the stock alternator to battery positive wire from the positive post and connect it to the post again with the new wire added.

6) Run the wire either through your fuse box if applicable or through a fuse. The fuse should be sized to match the max ampacity of your wire, not the output capability of your alternator. 150A fuse for 4awg wire..and 300A fuse for 1/0awg wire.

7) From the fuse, connect the wire to the positive terminal on your battery, again, leaving the stock wiring connected when you're done. The picture below shows the alternator to battery positive wire run from the alternator to the positive battery terminal. The other power wire is going to the amplifier.



(8)Last, let's move to the chassis to engine wire: (Again, because your alternator is grounded to the block, all you need to do is find a bolt somewhere on the block and connect it to the chassis. The alternator's mounting bracket is usually a good place to find these bolts).

Cool Again, either drill a new hole or connect this wire to the stock chassis ground. From the chassis ground, run the wire back to one of the mounting posts for the alternator (or to a bolt on the engine block).



9) That's it! You're done. Reconnect the vehicle's negative battery terminal and check out the difference!


--------------------------------------------------------------
Offical dealer for the following-

SOUNDSTREAM
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Re: HOW TO: The big 3
Monday, December 05, 2005 5:28 PM
Helpful hints:

1) Leave the stock wiring attached after you're done. Don't replace the stock wiring, add onto it. Current will take the path of least resistance anyway, so replacing the stock wire will only make more work for yourself.

2) When fusing your alternator to battery positive wire, fuse it toward the battery end of the wire. the battery will explode if it's overloaded, while the alternator will only burn out its regulator which won't cause much damage except to the alternator itself. Exploding batteries are no fun!

3) When crimping large gauge terminals for 1/0awg and sometimes even 4awg, a vice works well. Crimp one side of the terminal at a time, creating an overlapping edge. Put the boot around this and then wrap it in electrical tape if you want. the most secure connections will occur in this way.

4) Lastly, prepare all your materials and tools BEFORE you are ready to upgrade. Know what you are doing before you start so you can be done as quick as possible. The majority of vehicles have computers that will reset after the battery is disconnected for a long time and they can cause older vehicles to do strange things if they reset.

Hopefully this clears up most of the questions you had about why we upgrade the "Big 3" and how it helps to stop dimming and other electrical problems. If not, please don't hesitate to send me a PM or email.

(if a mod can merge this post with the original..it'll be greatly appreciated)


--------------------------------------------------------------
Offical dealer for the following-

SOUNDSTREAM
DB LINK
DB DRIVE
PANASONIC
GARMIN
ROSEN
SCOSCHE
XE DESIGNS
SOUNDGATE
PAC
LITEGLOW

Re: HOW TO: The big 3
Monday, December 05, 2005 6:34 PM
Awesome write up man, and good spots for the grounds



Re: HOW TO: The big 3
Monday, December 05, 2005 6:41 PM
sticky fo sho



Re: HOW TO: The big 3
Monday, December 05, 2005 8:10 PM
Question:

If the alternator is wired through the starter, then to the battery, Do we upgrade the wiring from the alt to the starter, then the starter to the battery or just make a beeline of sorts bypassing the starter all together with the upgrade and fuse?

If you covered that, sorry i must have missed it.



Re: HOW TO: The big 3
Monday, December 05, 2005 8:13 PM
El Fuego ( the unstable ) wrote:

Question:

If the alternator is wired through the starter, then to the battery, Do we upgrade the wiring from the alt to the starter, then the starter to the battery or just make a beeline of sorts bypassing the starter all together with the upgrade and fuse?

If you covered that, sorry i must have missed it.

all you gotta do is go straight from the battery to the alternator. the factory wiring is all left hooked up, so you won't mess anything up that way.


--------------------------------------------------------------
Offical dealer for the following-

SOUNDSTREAM
DB LINK
DB DRIVE
PANASONIC
GARMIN
ROSEN
SCOSCHE
XE DESIGNS
SOUNDGATE
PAC
LITEGLOW

Re: HOW TO: The big 3
Monday, December 05, 2005 8:30 PM
Thank you wysiwyg ( audio lord ).




Re: HOW TO: The big 3
Monday, December 05, 2005 8:54 PM
I believe the alternator to the starter has a fusible link in it... so it's best to just to alt to battery



Re: HOW TO: The big 3
Monday, December 05, 2005 9:07 PM
articzap wrote:

sticky fo sho


x2
Re: HOW TO: The big 3
Tuesday, December 06, 2005 4:11 PM
definate sticky!!!!!!!!



hmmmm.... I am confused, and the Blonde genius that is me,
does not easily get confused
Re: HOW TO: The big 3
Tuesday, December 06, 2005 5:19 PM
so i have to have a battery with 4 posts to do this?





Re: HOW TO: The big 3
Tuesday, December 06, 2005 6:16 PM
Did not use a 4 post battery when i did mine......

I did replace the wire going from the alt to starter and starter to batt because i got a bigger alt.

That was not hard just un hooked teh wire on alt and starter and ran new one and taped the old wires up..

Stick it


Re: HOW TO: The big 3
Tuesday, December 06, 2005 6:46 PM
keysurfer wrote:

Did not use a 4 post battery when i did mine......

I did replace the wire going from the alt to starter and starter to batt because i got a bigger alt.

That was not hard just un hooked teh wire on alt and starter and ran new one and taped the old wires up..

Stick it

you can use any battery...doesn' t HAVE to have top posts on it.

and i hope you fused both those wires when you did them like that. would have saved money, time, and parts with just running the one wire


--------------------------------------------------------------
Offical dealer for the following-

SOUNDSTREAM
DB LINK
DB DRIVE
PANASONIC
GARMIN
ROSEN
SCOSCHE
XE DESIGNS
SOUNDGATE
PAC
LITEGLOW

Re: HOW TO: The big 3
Tuesday, December 06, 2005 9:02 PM
niiiiiiiiiiiiiiiiiiiiiiice man that's wat i want to do too...i like the pictures those helped me a lot lol sometimes i dont get wat people are sayin from words alone, nice job, sticky this 4 sure

wysiwyg wrote:

i would say they bang, they don't really pound so much. but if
you want to bump, then they will bump and hit real hard and a lot good.

LOL
Re: HOW TO: The big 3
Tuesday, December 06, 2005 10:54 PM
Unless you are stangeriffic of sounddomain.com you should probably give credit ot the original author of that article =]

The official big 3 guide
Re: HOW TO: The big 3
Wednesday, December 07, 2005 7:28 AM
If I'm not mistaken, Speakerman on Realm of Excursion posted the same thing.

No matter - it's still worthy of a sticky!



The 50-50-90 rule: Anytime you have a 50-50 chance of getting something right, there's a 90% probability you'll get it wrong.
Re: HOW TO: The big 3
Wednesday, December 07, 2005 11:02 AM
wysiwyg

you said to use 300A fuse for 1/0awg wire. reason im wondering about this is cause on another forum im on they said to use that gauge wire to run back to my amp. i know where to get my question is where did you get the fuse and fuse holder. thanks i appreciate it






Re: HOW TO: The big 3
Wednesday, December 07, 2005 3:12 PM
Shaune Drake wrote:

wysiwyg

you said to use 300A fuse for 1/0awg wire. reason im wondering about this is cause on another forum im on they said to use that gauge wire to run back to my amp. i know where to get my question is where did you get the fuse and fuse holder. thanks i appreciate it

I get all my wiring supplies from http://www.knukonceptz.com


--------------------------------------------------------------
Offical dealer for the following-

SOUNDSTREAM
DB LINK
DB DRIVE
PANASONIC
GARMIN
ROSEN
SCOSCHE
XE DESIGNS
SOUNDGATE
PAC
LITEGLOW

Re: HOW TO: The big 3
Wednesday, December 07, 2005 3:16 PM
The fuse rating that you use should be based on the maximum (safe) current that particular wire can pass without heating up or catching fire. Depending on the length of wire, 1/0 gauge can safely handle ~300A, 4Ga can handle ~150A etc. Fusing the wire is just to prevent fire caused when wires heat up from carrying too much current; the fuses in your amps are there to protect your amp in case of overload/shorting.



The 50-50-90 rule: Anytime you have a 50-50 chance of getting something right, there's a 90% probability you'll get it wrong.
Re: HOW TO: The big 3
Wednesday, December 07, 2005 5:37 PM
4 awg can only support 125 amps....



Re: HOW TO: The big 3
Thursday, December 08, 2005 8:55 AM
thanks ive been looking around for that kind of stuff...

another question....

how do you cut 0/1 gauge wire?






Re: HOW TO: The big 3
Thursday, December 08, 2005 1:14 PM
use a razor blade and use a sawing motion



Re: HOW TO: The big 3
Thursday, December 08, 2005 5:47 PM
i just use wire cutters...takes a couple tries though


--------------------------------------------------------------
Offical dealer for the following-

SOUNDSTREAM
DB LINK
DB DRIVE
PANASONIC
GARMIN
ROSEN
SCOSCHE
XE DESIGNS
SOUNDGATE
PAC
LITEGLOW

Re: HOW TO: The big 3
Thursday, December 08, 2005 9:21 PM
Shaune Drake wrote:

thanks ive been looking around for that kind of stuff...

another question....

how do you cut 0/1 gauge wire?


I use sharp scissors, the wires are so fine it usually cuts the first time around.



My Myspace Page
Re: HOW TO: The big 3
Friday, December 09, 2005 5:29 AM
ok tanks





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