so i bought some 0 ga looking to do the big 3 and i had one wire that was perfect for the ground so i did that one first. i didnt replace the wire that was originally on the stock ground. when i replaced the wire with the 0 ga, my voltage dropped from 15.4 to 12.9. what could cause this? do i need to replace the little wire that was originally on the ground? or what. because i dont want to do all this wire work if it isnt going to help me at all. thanks guys!

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2002 Bonnie SSEI debadged and pieced together.
Daily Driver. 46,xxx original
Alpine 136bt
JX 360/4, Kenwood 6x9, infinity 6.5
Pdx 1.1000 on a W7 12"

1996 Viper GTS - The Rare Drive
11k miles

Autonetworkinc.com .... go buy something ;)

That little wire is for the main body harness, it needs to be grounded.

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Andrew - owner/operator of Bonnevilles Unlimited

2004 Bonneville GXP | 60k | White Gold Tricoat | custom built supercharged 3800 hot rod | garage queen
1997 Corvette | 55k | Silver Metallic | Z06 wheels | Date-night Hauler/Parts runner
2014 Town & Country Limited | Cashmere Pearl | 95k | Family Hauler
2002 Ram 1500 Quad Cab Sport | Black| 260k | Official Bonneville Hauler

Could that be the reason for my voltage issues?

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2002 Bonnie SSEI debadged and pieced together.
Daily Driver. 46,xxx original
Alpine 136bt
JX 360/4, Kenwood 6x9, infinity 6.5
Pdx 1.1000 on a W7 12"

1996 Viper GTS - The Rare Drive
11k miles

Autonetworkinc.com .... go buy something ;)

it turns out i just had a really bad ground. i cleaned it up and that put if back up to 15.3V which seemed. when it comes to the battery wire thoughh, do i need to run a separate wire from the front fuse box to the alternator? i just dont understand what gains i would see if i only replaced the battery + to the fuse box when the wire from the alternator to the fuse box is only 6 or 8 ga.

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2002 Bonnie SSEI debadged and pieced together.
Daily Driver. 46,xxx original
Alpine 136bt
JX 360/4, Kenwood 6x9, infinity 6.5
Pdx 1.1000 on a W7 12"

1996 Viper GTS - The Rare Drive
11k miles

Autonetworkinc.com .... go buy something ;)

A garden hose can easily deliver 1 gallon of water a minute. You can hook up a 24" water pipe to draw 1 gallon of water a minute, but there's really no benefit or sane reason to do so.
It would be better if you told us what gains you were hoping to get from this. I suspect it would be instructional for you to put an ammeter in series with the 6 or 8 gauge wires that go to the fuse block, and then turn on every electrical device you can think of in your car, and see what the actual maximum current load through your fuse box is, and compare that to the ampacity of an 8 gauge stranded copper wire. Unless you're hooking up something to your fuse box that draws a huge amount of current, I can't see any actual benefit to hooking up the fuse box with larger wires. New wires could be beneficial if your old cables are corroded or damaged, but otherwise I don't understand what benefit you're expecting to get.

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PontiacDad at WCBF `08: "By any chance, was his name. . .Radomir?"

R.I.P. 10/31/15: 1997 SE: "Silver Shadow"
`05 Mercedes S500

When i did mine i left the small wire from the fuse box to the alt and just put an additional zero guage from the alt to my batteries. so i left all the stock wiring there.

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l67 swap; 3'DP, power log, CAI, 10.5 wires, 3.5" pulley, autolite 104s, canned tune, 180 thermo, 2 Alpine type Xs, ARC Audio XDi 2000, Big three-0/1 , couple Red Tops, alpine x303, cleared lights, custom trunk.