This mod is for 98+ models of the Z, may work with earlier years, but some config of the alternator wire may be different.
This mod was also done on a non-body lifted Z, so lengths of cable may differ.
This is known as the BIG 3 Upgrade
1. Alternator wire (positive)
2. Alternator to frame (ground) - Optional, Not Reqired
3. Frame to battery (ground)
4. Block to battery (ground)
This mod can be done with a stock battery but I would use a high current one with top mount posts, I selected a Optima Yellow Top. Also decide what kind of cable you would like to use, this mod can be done with smaller then 0 gauge like I used, just depends on what you are running electrically. I selected JL Audio because it is 99.99% copper and true 1/0 AWG.
Upgrade the alternator wire first.
This is fairly simple, I only supplied one pic for this one because it is so simple. Remove your battery, then the metal tray that it sits in. Follow the alternator wire down to the junction block and remove with a pair of side cutters. Next remove the nut on the back of the alternator that attaches the cable to the alternator. Replace with a larger better quality cable. Replace battery tray and battery. Then run other end of new alternator cable to battery, top posts are best. Now The only thing on the side posts is the vehicle/computer power cable(red) and starter wire(black). See pic below. I also used crimp style ring terminals on my 0 gauge cable, which I will explain in more detail later.
Upgrading the Ground
Block to battery
After Upgrading your alternator wire, the ground is the next step.
First remove the negative cable from the battery and cut the 10 gauge black w/white stripe about 2 inches back for the end of the battery post lug. See pic.
This wire connects to the front of the vehicle and grounds the headlights and lighting assembly. Move this wire out of the way as shown.
Next, remove the 9/16 bolt on the front of the block that connects the 4 gauge wire to the battery. This bolt is behind the lower water pump hose and under the alternator housing. Once removed there will be a large star washer behind the stock cable, save this and the bolt. Next select your desired size of cable and crimp ring terminal to the end of about a 3 ft long piece of your cable. I happen to have a set of professional crimpers so that helps the job. See Pic. Then reinstall your new cable with star washer against the block. See Pic labeled block to battery.
Block to Battery
Run this piece of cable up to the battery and connect to top post along with the black w/white stripe wire you cut earlier. See pic.
Frame to Battery (Ground)
Next remove your frame to battery stock ground, this is easily accessed through the passenger fender and is a 10 mm bolt and keep bolt will be reused just like the block bolt. See Pic
Once 10 mm bolt removed, remove total negative harness and keep. I say keep, because if you ever sell the vehicle you can remove your high dollar cable and battery and give the stock back to the next person. See pic
Continue to next post.......
Edited by THEMEMPHISFORCE, 20 June 2008 - 07:33 PM.