This is the second section of my electrical system upgrade. You can read the first part, how to upgrade the OEM ground wire, here.

This how-to will be covering the details on how to perform the upgrade known as the 'Big Three'. Essentially, it will yeild the following:

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

The BIG THREE consists of:

(1) Battery negative to chassis
(2) Alternator to battery positive
(3) Engine Block to chassis

...it essentially does the same thing as a conventional grounding kit, however it does so in a different fashion. I am not a big fan of grounding kits as I prefer this method. People will argue this one way or another, but I swear by this. So, let's get started!

TOOLS/SUPPLIES
10mm Socket
12mm Socket
Ratchet
10ft. of 1/0AWG Power Cable
3 1/0AWG Ring Terminals
1 1/0AWG Fuse Terminal w/ 300-amp fuse

STEP I - BATTERY NEGATIVE TO CHASSIS
Simple enough. We are going to be making an attachement from the negative terminal of the battery to the chassis. If you peek behind the battery you will see a good place to plant the wire.



Remove the bolt with your 10mm socket and sand away the spot to bare steel. After that, attach about a 1-ft. length of wire to one of your terminals, crimp, and bolt everything back together.



STEP II - BATTERY POSITIVE TO ALTERNATOR POST

Alright, this one is a bit more tricky. You are going to need about 5ft of wire split into two equal 2.5ft. lengths. We are going to be attaching the wire to the battery positive to a fuse terminal, then fuse terminal to alternator post.

You can find the alternator just to the outside end of the engine block on the passenger side. Look for a rubber boot covering a bolt. That's your alternator post. We'll start there. Remove the bolt using a 12mm socket.



Attach one crimped end of the 1/0AWG wire to the bolt, then screw everything back together.



Take the lead attached to the alt. post and run this to the fuse. Take the other length of wire and run this from the opposite end of the fuse and lead it to the battery. We're almost done![/COLOR]

 

STEP III - ENGINE BLOCK TO CHASSIS

The final step is simple enough. Start off by locating a spot where you want to land the lead on the chassis. I chose an empty bolt hole located by the engine block. Sand away as we have done before.



Next, simply ground this to the engine block. I chose one of the 10mm bolts located on the side of the block. You can choose just about anywhere on the block; for instance, you will see two grounding points on top of the block. Golden rule with grounding wires is to keep them as short as possible, so just keep that in mind when doing this...



...and now you're done! Here's a shot of the battery when all is said and done...pretty bada'ss if I say so myself!





[/COLOR]

 

I have been meaning to do the ALT to BATT +. Do we really need 300 amps for the fuse? Isnt that 2x the amount the alt can put out?

BTW is your amp's ground connected to the battery or just a spot in the trunk?

 

The fuse should be rated for the capacitance of the wire, not the alt.
Trunk. Grounded to the spot where the spare tire cover bolt would be.

 

nice writeup

isn't 0/1 a tad overkill though? i mean i was going to do this, but with some high strand 4 gauge (8 gauge would even work iirc).

 

Great writeup as usual Dan. Do I smell a sticky?

 

IMHO, the more current available, the better. If you take a very serious look at why people use a smaller gauge wire, it's for the purpose of saving a few bucks when purchasing the wire...in my situation, I don't mind throwing down an extra $20 to do this '*****-to-the wall'

I certainley wouldn't object.

 

heh true the more current the better, but with that short run of wiring in the engine bay, voltage drop across the length of wire is negligible no? (to a certain extent of course)

what 0 gauge you're using? the kicker 0 gauge is uber flexible...whoever R&D that cable definately knew what they were doing!

 

Stinger Expert, my friend...nothing but the best for this upograde!

 

So after the grounding kit and the big 3 did you notice a difference?

 

what kind of terminal is that on the positive terminal?

 

Well, it started up a bit quicker, but that was it. I did not really have a chance to drive it around yet as I had to drop the car off for new tires & an alignment...I'll drop back in here later on today when it's done.

 

Stinger Expert SXBTM

 

Nicely done Dan .

 

Yes 1/0 gauge wire is over kill. You can run a 3000 watt amp a foot away from the battery and run 4 gauge all day long. Its becuase your 17 feet away from the battery to the trunk so thats why you need the big gauges. Kinda like sucking a lemon seed through a straw. It'll get up there it just takes a while. So yes all you do need for this set up is 4 gauge. And also you can add about 3 more grounds than just these. I have a total of 7 grounds just in my engine bay. My headlights don't dim one bit.

 

Here we go...

I agree.

Huh? Electrons travel, in general, at 3.0x10^8 m/s. That's 67 MILLION miles per hour. This isn't fast enough?!

Again, you can shortcut this and use a 4AWG wire, but I perfer to use a larger, thicker gauge for even greater voltage stabalization.

I am only going to add one more grounding point, and that's a starter ground. An it'll be 1/0AWG SE.

Your system is likley running only 700W in actuality, so 4AWG will most certainley fit the bill.


While I wholly appreciate your input, I am not going to advocate using anything other than 1/0AWG. Go on any car audio forum and tout that you are running 4AWG vs. 1/0AWG...just hope you have your flame-suit on.

 

looks good, Dan. ill be doing it with 0 awg as well, for the hell of it.

 

That looks really good. Almost a mirror image of what I am working on. Back to the 300A fuse though.....you say you're protecting the 1/0 AWG wire. But if there is a short, isn't it going to be the path of least resistance that gets taken out, which would be the diodes in the alternator instead of the fuse? Just wondering.

 

Electricity, not electrons.

 

Metal, that job looks professional. Is it ok to do the big three with only the top battery terminals? I only have one set of them.

 

Great writeup, but quick question, i'm going to be installing my new amp and speakers in about a week, and the amp is 40Ax2, so I picked up some 80A glass fuses to place in line of the power cable, will this not be adequate? Don't want to fry a new $380 amp.

Edit: And all the power wire that came with my amp says is 600W maximum :/

Edit dos: If only I could read, this was from the alternator to the battery, :/ this doesn't apply to amps, does it?

 

quick question for METAL MAXIMA, is your car a 5 gen, or 5.5 gen?

 

if you have terminals that can accomodate the extra wires, then go for it. most people, like myself, get the batteries with the side posts so we can put the oem wiring on the side posts and put the new wiring on top. it looks cleaner that way.

 

More than likley you are correct. However, if the alternator DOES short, you have got bigger things to worry about other than the diodes...

 

Electricty is the flow of electrons...

 

Yep. But you would wind up having to use ring terminals for the OEM power lead and splice a fuse in line with it.

 

NO. Don't use a fuse that exceeds the amperage of the amps. Reason you rate the fuse for the wire in this case is because you are going from the alternator to the battery.


amp ---> wire ---> fuse -> wire > battery

 

Electron drift in a copper wire is << c. The speed of electricity is ~c. You can find a good little write-up here. Make sure that you click on the link at the bottom that gives an example using copper.

 

OK Metal, so using the top battery terminals it would be like this then.....

(1) Battery negative to chassis [add-on]
(2) Alternator to battery positive [replaced OEM wiring with new 1/0AWG and inline 300A fuse]
(3) Engine Block to chassis [add-on]

 

Nice write up. I found upgrading the alternator ground to chasis to help as well not sure if you did that or not since I already did this years ago.

I don't really see the point of having the 300A fuse though. Its not really going to protect anything at all. You should base it off the alternators rating since you shouldn't be getting anymore current than that. The whole point is to protect the battery not the wire. Remember that a fuse can handle more current than it's rated for, for short amounts of time.

 

Why not ground it as close to the alternator case as possible, such as one of the mounting bolts, giving a direct path rather than forcing it through the engine block?

 

who cares if that wire is overkill, it looks way cool and that's what matters

 

I highly suggest using star washers between newly bared metal and your contacts... once you brush away paint, that bare metal is going to immediately start rusting. Without a star washer digging into the bare metal, you'll have significantly reduced contact after a year (maybe less if you live in an area that salts the roads) and lose even more power than what you started with.

Individual electron velocity is irrelevant... drift speed is irrelevant. We use larger wires over longer runs to reduce the voltage drop from point A to point B. V=IR, the resistance R of the wire is fixed. For low currents, the voltage drop is minimal. As current draw increases (headlights, stereos, etc.), you want to minimize the voltage drop across the supply line... the only way to do this is to decrease the wire's resistance. The only (economical) way to do that is to increase the area (i.e., larger guage).

 

ok_____________________________

 

My sentiments exactly.....

 

Looking good Dan...I'm due for some of those battery terminals..

 

New the site....I enjoyed reading your write-up, very imformative. Can't wait to see more.

 

You and your damn writeups. I'm going to have to bump this one for future reference. Thanks Dan.

 

how do you plan on grounding the alt?
also what is the point...it grounds through the engine, which it bolts up to and the wireing harness if i'm not mistaken...

btw your set up looks very nice.

 

^^yes, but my car came with a huge 10 or 12 gauge wire grounded to the chasis so I replaced it with something bigger and it brought up my idle voltage about 3 tenths of a volt.