i mostly use this board for parts hunting as i have an 05 sxt, but i just completed this last week. i did mine a bit differently based on another how-to guide. the points used may be different as well as i have the 2.0, but i will take pics of it tomorrow and post them.
on the passenger side there were 2 gounding points on the fender, one from the back of the engine and one on the front motor mount. i think it had 8 or 10 gauge, maybe even 12. i do have a pic of that i can post as well showing it next to the 4 gauge i used.
there were 2 direct connections for grounding the battery. one was routed behind the fuse box to a small screw on the fender (replaced this with a new screw) and another to the stock location on the block.
for the positive side, i ran a piece of 4 gauge directly to the alternator. i re-used the stock t connection by removing the post mount and replacing it with a section of 8 gauge, and left the stock wire running down to the starter.
to make it a little cleaner i bought a set of these.
for the positive side, i had a 4g going to the alt, and a 4g fused running to the trunk for the system that i am about to begin. one 8g fed the line to the T connection (starter and fuse box), the other 8g ran to the front seat via the hole/grommet (drilled through passenger side of firewall - so much room to work with compared to the driver's) with the 4g. it will feed a small amp under the passenger seat to power the new dash speakers (which will be used by the bt gps).
negative just used the 2 new 4g connections mentioned earlier.
topped it all off with a stinger spv44 battery since i was there. this was a perfect excuse to buy another tool. i call it the crimpler. just load it up and get a quality crimp everytime, just by beating the hell out of it with a hammer! it will work up to 0g.
